Free tool

LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Killer Croc Tail-Gator

Checking

70907 Killer Croc Tail-Gator

428 pieces in 188 part and color combinations, plus 4 minifigures.

The official piece count includes the 32 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

3 more look-alike pairs
  • Technic Axle Connector Smooth [with x Hole + Orientation] Black ×6 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
  • Tile Special 1 x 1 with Clip with Rounded Edges Black ×2 Dark Bluish Gray ×1 Black is darker than Dark Bluish Gray.
  • Tile Special 1 x 2 Grille with Bottom Groove Black ×1 Dark Bluish Gray ×3 Black is darker than Dark Bluish Gray.
Show

Piece checklist

Black 83 pieces

  • Animal Body Part, Bat Wing with Shaft [Chima Bat Wing] Black Part 15082 Element 6051532 ×2
  • Bar 1 x 6 [Closed Studs] Black Part 6140 Element 6415609 or 614026 ×1
  • Bracket 1 x 2 - 1 x 2 Inverted Black Part 99780 Element 6020193 Also in Dark Bluish Gray ×3
  • Brick Curved 2 x 1 No Studs [1/2 Bow] Black Part 11477 Element 6047276 Also in Dark Bluish Gray ×2
  • Brick Curved 3 x 1 No Studs Black Part 50950 Element 4251161 ×2
  • Brick Curved 4 x 2 No Studs Black Part 93606 Element 4647286 ×1
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Black Part 54200 Element 4504382 or 4287159 1 spare in the box ×4
  • Brick Sloped Inverted 45° 4 x 4 Double with 4 x 2 Recessed, 2 Holes Black Part 72454 Element 4658977 ×1
  • Brick Wedged, Curved Inverted 6 x 4 Black Part 43713 Element 4180469 ×1
  • Equipment Hose Nozzle / Gun with Side String Hole Simplified Black Part 60849 Element 6641462 or 4537551 1 spare in the box ×2
  • Lattice 3 x 6 Module with Studs Black Part 23444 Element 6172984 or 6138603 ×1
  • Launcher, Plate Special 1 x 2 with Mini Blaster Black Part 15403 Element 6102734 ×2
  • Plate 1 x 4 Black Part 3710 Element 371026 ×4
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Black Part 2654 Element 4617551 or 4278359 ×2
  • Plate Special 1 x 1 with Clip Horizontal [Thick Open O Clip] Black Part 61252 Element 6308000 or 4517925 ×2
  • Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] Black Part 60897 Element 6330189 or 4617547 ×2
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Black Part 15573 Element 6092585 Also in Dark Bluish Gray ×2
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Black Part 60470b Element 6310268 or 4556158 ×1
  • Technic Axle 4 Black Part 3705 Element 370526 ×5
  • Technic Axle Connector Double Flexible [Rubber] Black Part 45590 Element 4198367 ×2
  • Technic Axle Connector Smooth [with x Hole + Orientation] Black Part 59443 Element 6084612 or 4512363 Also in Dark Bluish Gray ×6
  • Technic Ball Joint with 8-Ball Print Black Part 32474pr0002 Element 6176285 ×1
  • Technic Ball Joint with Through Axle Hole Black Part 53585 Element 4286267 ×2
  • Technic Beam 1 x 5 Thick Black Part 32316 Element 4142135 or 4140429 ×2
  • Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise Black Part 15100 Element 6073231 ×4
  • Technic Pin Connector Round [Slotted] Black Part 62462 Element 6173119 or 4526982 ×3
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 2 spares in the box ×8
  • Technic Pin with Friction Ridges Lengthwise and Towball Black Part 6628 Element 4184169 or 662826 ×5
  • Technic Steering Wheel Small (3 Studs Diameter) Black Part 2819 Element 4580509 or 4160709 ×1
  • Tile 2 x 3 Black Part 26603 Element 6162892 ×1
  • Tile Special 1 x 1 with Clip with Rounded Edges Black Part 15712 Element 6335388 or 6066102 Also in Dark Bluish Gray ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 Also in Dark Bluish Gray ×1
  • Tyre 49.53 x 20 Black Part 15413 Element 6518565 or 6055626 ×4
  • Weapon Batarang Black Part 98721 Element 4650620 1 spare in the box ×1

Light Bluish Gray 79 pieces

  • Bracket 1 x 2 - 2 x 2 Inverted Light Bluish Gray Part 99207 Element 4654580 ×6
  • Brick 1 x 1 Light Bluish Gray Part 3005 Element 4211389 ×1
  • Brick 2 x 2 Corner Light Bluish Gray Part 2357 Element 4211349 ×2
  • Brick Curved 2 x 2 x 2/3 Light Bluish Gray Part 15068 Element 6102357 ×1
  • Brick Round 1 x 1 Open Stud Light Bluish Gray Part 3062b Element 4211412 ×2
  • Brick Round 2 x 2 Truncated Cone Light Bluish Gray Part 98100 Element 6028324 ×1
  • Brick Round 2 x 2 [Grill] Light Bluish Gray Part 92947 Element 4650645 or 4610816 ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Light Bluish Gray Part 54200 Element 4521921 or 4244372 1 spare in the box ×1
  • Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version] Light Bluish Gray Part 15672 Element 6093859 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin Light Bluish Gray Part 3040b Element 4211614 ×2
  • Brick Sloped 45° 2 x 2 Light Bluish Gray Part 3039 Element 4211410 ×1
  • Brick Special 1 x 2 with 2 Studs on 1 Side Light Bluish Gray Part 11211 Element 6015344 ×2
  • Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side Light Bluish Gray Part 22885 Element 6123809 ×3
  • Door 1 x 4 x 6 Barred with Stud Handle Light Bluish Gray Part 60621 Element 4610149 or 4519882 ×2
  • Exhaust Pipe with Technic Pin - Flat End, Rounded Hole Light Bluish Gray Part 14682 Element 6044706 ×2
  • Plate 2 x 2 Light Bluish Gray Part 3022 Element 4211397 ×1
  • Plate 3 x 3 Light Bluish Gray Part 11212 Element 6015347 ×2
  • Plate Round 1 x 1 with Open Stud Light Bluish Gray Part 85861 Element 6168647 or 6124825 1 spare in the box ×1
  • Plate Round 1 x 1 with Solid Stud Light Bluish Gray Part 6141 Element 4211525 1 spare in the box Also in Flat Silver ×2
  • Plate Special 1 x 2 5.9mm Centre Side Towball Socket Light Bluish Gray Part 14704 Element 6414561 or 6338165 ×2
  • Plate Special 1 x 2 Side Handle [Free Ends] Light Bluish Gray Part 2540 Element 4211632 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Light Bluish Gray Part 15573 Element 6066097 or 4211451 ×4
  • Plate Special 1 x 2 with Door Rail Light Bluish Gray Part 32028 Element 4211568 ×1
  • Plate Special 2 x 2 x 2/3 with Two Studs On Side and Two Raised [Solid Anti-stud] Light Bluish Gray Part 99206 Element 4654577 ×2
  • Technic Axle Towball Light Bluish Gray Part 2736 Element 6443149 or 4211375 ×1
  • Technic Beam 3 x 3 T-Shape Thick Light Bluish Gray Part 60484 Element 4552348 or 4535772 ×2
  • Technic Brick 1 x 16 [15 Pin Holes] Light Bluish Gray Part 3703 Element 4211443 ×2
  • Technic Brick 1 x 2 [2 Pin Holes] Light Bluish Gray Part 32000 Element 4211541 ×4
  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 2 spares in the box ×8
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 1 spare in the box ×4
  • Tile 1 x 2 with Groove Light Bluish Gray Part 3069b Element 4211414 ×1
  • Tile Special 1 x 2 Grille with Bottom Groove Light Bluish Gray Part 2412b Element 4211350 ×6
  • Tile Special 1 x 2 with Handle Light Bluish Gray Part 2432 Element 4211357 ×1
  • Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Light Bluish Gray Part 56145 Element 4297210 ×4

Dark Bluish Gray 77 pieces

  • Arm Mechanical with 2 Clips [Battle Droid] Dark Bluish Gray Part 30377 Element 6319332 or 4210900 1 spare in the box ×1
  • Bar 6L with Stop Ring Dark Bluish Gray Part 63965 Element 6170420 or 6081987 ×1
  • Bar Holder with Clip Dark Bluish Gray Part 11090 Element 6336970 or 6015890 ×2
  • Bracket 1 x 2 - 1 x 2 Inverted Dark Bluish Gray Part 99780 Element 6000606 Also in Black ×1
  • Bracket 1 x 2 - 2 x 2 Dark Bluish Gray Part 44728 Element 6117972 or 6048854 ×6
  • Brick Curved 1 x 2 x 1 1/3 with Curved Top Dark Bluish Gray Part 6091 Element 6411327 or 4210797 ×2
  • Brick Curved 2 x 1 No Studs [1/2 Bow] Dark Bluish Gray Part 11477 Element 6029948 Also in Black ×4
  • Brick Sloped Inverted 45° 2 x 1 Dark Bluish Gray Part 3665 Element 4211096 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Dark Bluish Gray Part 3660 Element 4211000 ×4
  • Brick Special 1 x 2 with Grille Dark Bluish Gray Part 2877 Element 4210636 ×1
  • Brick Special 1 x 2 with Handle Dark Bluish Gray Part 30236 Element 4211128 ×1
  • Handlebars Dark Bluish Gray Part 30031 Element 4261908 or 4210644 ×1
  • Launcher Trigger, Weapon Gun Trigger Dark Bluish Gray Part 15392 Element 6051334 1 spare in the box ×2
  • Plate 1 x 3 Dark Bluish Gray Part 3623 Element 4211133 ×2
  • Plate 1 x 6 Dark Bluish Gray Part 3666 Element 4211056 ×8
  • Plate 1 x 8 Dark Bluish Gray Part 3460 Element 4210998 ×1
  • Plate 2 x 4 Dark Bluish Gray Part 3020 Element 4211065 ×2
  • Plate 2 x 8 Dark Bluish Gray Part 3034 Element 4210997 ×3
  • Plate 3 x 3 Dark Bluish Gray Part 11212 Element 6039176 ×2
  • Plate 6 x 16 Dark Bluish Gray Part 3027 Element 4226358 ×1
  • Plate 6 x 6 Dark Bluish Gray Part 3958 Element 4211134 ×2
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Dark Bluish Gray Part 15573 Element 6092572 Also in Black ×3
  • Technic Axle 5.5 with Stop [Rounded Short End] Dark Bluish Gray Part 59426 Element 4508553 ×4
  • Technic Axle Connector Smooth [with x Hole + Orientation] Dark Bluish Gray Part 59443 Element 6084613 or 4516546 Also in Black ×2
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Dark Bluish Gray Part 11214 Element 6015356 ×2
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Dark Bluish Gray Part 60483 Element 6265093 or 6006141 ×2
  • Technic Beam 3 x 5 L-Shape Thick Dark Bluish Gray Part 32526 Element 4210753 ×4
  • Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Socket Dark Bluish Gray Part 48169 Element 6278974 or 4225973 ×1
  • Tile 1 x 6 with Groove Dark Bluish Gray Part 6636 Element 4210651 ×1
  • Tile Special 1 x 1 with Clip with Rounded Edges Dark Bluish Gray Part 15712 Element 6344022 or 6071226 Also in Black ×1
  • Tile Special 1 x 2 Grille with Bottom Groove Dark Bluish Gray Part 2412b Element 4210631 Also in Black ×3
  • Tool Pickaxe Dark Bluish Gray Part 3841 Element 4211007 ×1
  • Wheel Arch, Curved Wedge 4 x 3 with 2 x 2 Opening and 4 Studs Dark Bluish Gray Part 47755 Element 4294289 ×1
  • Wheel Arch, Mudguard 4 x 2 1/2 x 1 Dark Bluish Gray Part 98282 Element 6170503 or 4646522 ×2
  • Window 1 x 4 x 3 without Shutter Tabs Dark Bluish Gray Part 60594 Element 4551044 ×1

Red 61 pieces

  • Bracket 1 x 2 - 1 x 2 Inverted Red Part 99780 Element 6089698 ×2
  • Brick 1 x 1 Red Part 3005 Element 300521 ×4
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×1
  • Brick 2 x 4 Red Part 3001 Element 300121 ×1
  • Brick Curved 1 x 2 x 1 1/3 with Curved Top Red Part 6091 Element 6184782 or 609121 ×2
  • Brick Curved 1 x 4 x 1 1/3 No Studs Red Part 10314 Element 6083618 ×3
  • Brick Curved 2 x 1 No Studs [1/2 Bow] Red Part 11477 Element 6029946 ×2
  • Brick Sloped Inverted 45° 2 x 1 Red Part 3665 Element 366521 ×1
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Red Part 3660 Element 366021 ×1
  • Brick Special 1 x 1 with Stud on 1 Side Red Part 87087 Element 4558886 ×4
  • Brick Special 1 x 2 with Pin Red Part 2458 Element 245821 ×4
  • Brick Wedged, Curved Triple 4 x 6 x 2/3 with 4 Studs Red Part 52031 Element 4259903 ×1
  • Equipment Dynamite Sticks Red Part 64728 Element 6270088 or 4538780 ×1
  • Plate 1 x 2 Red Part 3023 Element 302321 ×9
  • Plate 1 x 3 Red Part 3623 Element 362321 ×2
  • Plate 1 x 4 Red Part 3710 Element 371021 ×5
  • Plate 1 x 6 Red Part 3666 Element 366621 ×4
  • Plate 1 x 8 Red Part 3460 Element 346021 ×1
  • Plate 2 x 3 Red Part 3021 Element 302121 ×2
  • Plate 2 x 6 Red Part 3795 Element 379521 ×1
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Red Part 32054 Element 4140806 or 4125198 ×2
  • Tile 1 x 1 with Groove Red Part 3070b Element 307021 1 spare in the box ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Red Part 2412b Element 241221 Also in Trans-Red ×2
  • Wedge Plate 4 x 4 with 2 x 2 Cutout Red Part 43719 Element 6275399 or 4561034 ×1
  • Wheel Arch, Mudguard 4 x 2 1/2 x 1 Red Part 98282 Element 6170507 or 6143434 ×1

Reddish Brown 33 pieces

  • Brick 1 x 1 Reddish Brown Part 3005 Element 4211242 ×2
  • Brick 1 x 2 Reddish Brown Part 3004 Element 4613963 or 4211149 ×2
  • Brick 2 x 4 Reddish Brown Part 3001 Element 4211201 ×1
  • Brick Curved 1 x 2 x 1 1/3 with Curved Top Reddish Brown Part 6091 Element 6335567 or 6035547 ×2
  • Brick Curved 1 x 4 x 1 1/3 No Studs Reddish Brown Part 10314 Element 6035561 ×1
  • Plate 2 x 3 Reddish Brown Part 3021 Element 4211189 ×6
  • Plate Special 1 x 2 with Pin Hole on Top Reddish Brown Part 11458 Element 6138664 ×2
  • Tile 1 x 2 with Groove Reddish Brown Part 3069b Element 4211151 ×1
  • Tile 1 x 3 Reddish Brown Part 63864 Element 6100769 ×2
  • Tile 1 x 4 with Groove Reddish Brown Part 2431 Element 4211194 ×4
  • Tile Special 1 x 1 with Clip with Rounded Edges Reddish Brown Part 15712 Element 6348057 or 6071274 ×6
  • Tile Special 1 x 2 Grille with Bottom Groove Reddish Brown Part 2412b Element 4224243 ×4

Yellow 16 pieces

  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×2
  • Brick 2 x 8 Yellow Part 3007 Element 4639693 or 300724 ×1
  • Plate 2 x 6 Yellow Part 3795 Element 379524 ×1
  • Plate Round 1 x 1 with Solid Stud Yellow Part 6141 Element 614124 1 spare in the box Also in Trans-Yellow ×8
  • Technic Rubber Belt Large [33mm ID] [Round Cross Section] Yellow Part 85546 Element 4544151 or 70905 ×4

Blue 11 pieces

  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×2
  • Brick 1 x 4 Blue Part 3010 Element 301023 ×2
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×1
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×2
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×4

Flat Silver 11 pieces

  • Chain 6L [5 Links] Flat Silver Part 92338 Element 6323689 or 6064049 ×2
  • Engine / Air Scoop 2 x 2 Flat Silver Part 50943 Element 6076604 ×1
  • Plate Round 1 x 1 with Solid Stud Flat Silver Part 6141 Element 4633691 1 spare in the box Also in Light Bluish Gray ×4
  • Plate Special 1 x 4 with Angled Tubes Flat Silver Part 61072 Element 4632100 ×2
  • Weapon Sai Flat Silver Part 98139 Element 6270136 or 4646867 1 spare in the box ×2

Dark Tan 10 pieces

  • Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×2
  • Tile 1 x 3 with Wood Grain and 4 Nails Print Dark Tan Part 63864pr0009 Element 6177892 ×5
  • Tile 1 x 6 with Wood Decoration Print Dark Tan Part 6636pr0014 Element 6176227 ×3

White 9 pieces

  • Animal Body Part, Dog Bone [Short] White Part 93160 Element 6360202 or 4600294 1 spare in the box ×1
  • Animal Body Part, Horn (Cattle) / Tentacle / Vine / Branch / Tongue - Long White Part 13564 Element 6269074 or 6032360 1 spare in the box ×2
  • Animal Body Part, Skull, Cattle White Part 13695 Element 6032363 ×1
  • Brick 2 x 10 White Part 3006 Element 4617855 or 300601 ×1
  • Brick Wedged, Curved Triple 4 x 6 x 2/3 with 4 Studs White Part 52031 Element 4261565 ×1
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×1
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×1
  • Tile 2 x 3 White Part 26603 Element 6552162 or 6550161 ×1

Green 7 pieces

  • Animal, Frog Green Part 33320 Element 6171101 or 4157270 ×2
  • Plate 1 x 2 Green Part 3023 Element 302328 ×1
  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Green Part 32064a Element 6206248 or 4233489 ×4

Trans-Red 6 pieces

  • Plate 1 x 1 Trans-Red Part 3024 Element 6513963 or 6252042 1 spare in the box ×4
  • Tile Special 1 x 2 Grille with Bottom Groove Trans-Red Part 2412b Element 6250158 or 4190187 Also in Red ×2

Trans-Clear 5 pieces

  • Tile Round 1 x 1 Trans-Clear Part 98138 Element 6514191 or 6274738 2 spares in the box ×5

Dark Azure 4 pieces

  • Brick Sloped Inverted 45° 2 x 1 Dark Azure Part 3665 Element 6298469 or 6135608 ×3
  • Wheel Arch, Mudguard 4 x 2 1/2 x 1 Dark Azure Part 98282 Element 6589634 or 6440106 ×1

Tan 4 pieces

  • Brick 1 x 6 Tan Part 3009 Element 4112982 or 300905 ×1
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×1
  • Technic Brick 1 x 4 [3 Pin Holes] Tan Part 3701 Element 4234365 or 370105 ×2

Trans-Yellow 3 pieces

  • Plate 1 x 2 Trans-Yellow Part 3023 Element 6514002 or 6240211 ×1
  • Plate Round 1 x 1 with Solid Stud Trans-Yellow Part 6141 Element 6514056 or 6240216 1 spare in the box Also in Yellow ×1
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Trans-Yellow Part 2654 Element 6581773 or 6171728 ×1

Dark Red 2 pieces

  • Tile Round 1 x 1 Dark Red Part 98138 Element 6284585 or 6028132 1 spare in the box ×2

Medium Nougat 2 pieces

  • Box / Crate with Handholds 3 x 4 x 1 2/3 Medium Nougat Part 30150 Element 6035734 ×2

Bright Light Orange 1 piece

  • Tile 2 x 2 with Groove Bright Light Orange Part 3068b Element 6020147 or 4525871 ×1

Dark Green 1 piece

  • Plant, Sea Grass Dark Green Part 30093 Element 6269984 or 4569217 ×1

Orange 1 piece

  • Brick and Axle Separator v2.0 Orange Part 96874 Element 6240515 or 4654448 ×1

Trans-Brown 1 piece

  • Windscreen 2 x 6 x 2, Wide Top Trans-Brown Part 4176 Element 4176111 or 4173328 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 70907-1 [No Color/Any Color] Part 30823 Element 6177706 ×1

Minifigures 4 figures

  • Batman, Black Suit, Black Cape and Cowl, Utility Belt (3626cpr9996 Head) Minifigure, checked as a whole figure ×1
  • Tarantula Minifigure, checked as a whole figure ×1
  • Zebra-Man Minifigure, checked as a whole figure ×1
  • Killer Croc, Blue Pants (Big Fig) Minifigure, checked as a whole figure ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.