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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.

Sea Serpent

Checking

6057 Sea Serpent

106 pieces in 53 part and color combinations, plus 5 minifigures.

LEGO counts 126 pieces. This inventory comes from a separate parts catalog and lists 128, including the 22 parts inside the minifigures; the two do not always count the same elements, so their totals differ. 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.

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Piece checklist

Bricks Sloped 19 pieces

  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×3
  • Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin Black Part 3747a ×1
  • Brick Sloped Inverted 34° 3 x 1 without Internal Stopper Black Part 4287a ×2
  • Brick Sloped Inverted 45° 2 x 1 Black Part 3665 Element 366526 ×1
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×4
  • Brick Sloped 33° 3 x 1 Blue Part 4286 Element 428623 ×6
  • Brick Sloped 45° 2 x 1 with Bottom Pin Blue Part 3040b Element 4121936 or 304023 ×2

Minifig Shields, Weapons, & Tools 13 pieces

  • Weapon Bow and Arrow [Large] Brown Part 4499 Element 449925 ×1
  • Weapon Halberd / Axe Brown Part 3848 Element 384825 ×1
  • Weapon Pike / Spear Round End Brown Part 4497 ×1
  • Weapon Crossbow and Bolt Dark Gray Part 2570 Element 257027 ×1
  • Weapon Sword / Shortsword [Shiny Solid Smooth ABS] Dark Gray Part 3847a ×2
  • Shield Ovoid with Blue Dragon Print Light Gray Part 2586pr0012 ×2
  • Shield Triangular with Black Falcon and Blue Border Print Light Gray Part 3846pr0028 Element 4189073 ×1
  • Shield Triangular with Blue Dragon Print Light Gray Part 3846pr0024 ×4

Plates 13 pieces

  • Plate 1 x 10 Black Part 4477 Element 447726 ×1
  • Plate 1 x 2 Black Part 3023 Element 302326 ×2
  • Plate 1 x 6 Black Part 3666 Element 366626 ×2
  • Plate 2 x 2 Corner Black Part 2420 Element 242026 ×2
  • Plate 2 x 4 Black Part 3020 Element 302026 ×4
  • Plate 1 x 2 Blue Part 3023 Element 302323 ×1
  • Plate 2 x 6 Red Part 3795 Element 379521 ×1

Plates Special 12 pieces

  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Black Part 6019 Element 601976 or 601926 ×4
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Black Part 3794a ×4
  • Plate Special 1 x 4 Offset with Bar Holes Black Part 4590 Element 6002559 or 4278029 ×1
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] Blue Part 4085c Element 408523 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Blue Part 3794a ×1

Plates Round Curved and Dishes 11 pieces

  • Plate Round 1 x 1 with Solid Stud Black Part 6141 Element 614126 ×2
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Black Part 2654 Element 4617551 or 4278359 ×6
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Brown Part 4032a Element 403225 ×1
  • Plate Round 1 x 1 with Solid Stud Yellow Part 6141 Element 614124 ×2

Bars, Ladders and Fences 5 pieces

  • Antenna 1 x 4 with Rounded Top Black Part 3957a ×4
  • Bar 1 x 3 [Clip / Anti-Stud] Black Part 4735 Element 4141580 or 473576 ×1

Minifig Accessories 5 pieces

  • Equipment Oar / Paddle Brown Part 2542 Element 4106940 or 254275 ×4
  • Equipment Goblet / Glass Yellow Part 2343 Element 626924 or 234324 ×1

Bricks 4 pieces

  • Brick 1 x 1 Black Part 3005 Element 300526 ×2
  • Brick 1 x 6 Black Part 3009 Element 300926 ×2

Bricks Special 4 pieces

  • Brick Special 1 x 1 Studs on 4 Sides Black Part 4733 Element 473326 ×2
  • Brick Special 1 x 1 with Headlight Blue Part 4070 Element 407023 ×2

Bricks Wedged 4 pieces

  • Brick Wedged, Sloped Inverted 6 x 6 x 1 Boat Bow Black Part 2626 Element 4188918 or 262626 ×4

Flags, Banners and Signs 3 pieces

  • Flag 2 x 2 Square with Red Square and Yellow / Blue Dragon Print Blue Part 2335pr0009 ×1
  • Flag 4 x 1 Wavy [First Wave Left] Green Part 4495a ×1
  • Flag 4 x 1 Wavy [First Wave Left] Yellow Part 4495a ×1

Minifig Headwear Accessories 3 pieces

  • Headwear Accessory Plume Dragon Red Part 87687 Element 4190221 ×1
  • Headwear Accessory Plume Dragon Wing Left Red Part 87685 ×1
  • Headwear Accessory Plume Dragon Wing Right Red Part 87686 ×1

Panels 2 pieces

  • Castle Turret Top 4 x 8 x 2 1/3 Blue Part 6066 Element 606623 ×2

Plates Wedged 2 pieces

  • Wedge Plate 7 x 6 Boat Bow without Stud Notches Red Part 2625 ×2

Tiles Special 2 pieces

  • Tile Special 1 x 1 with Clip and Straight Tips Black Part 2555 Element 255526 ×2

Transportation - Sea and Air 2 pieces

  • Boat, Mast 2 x 2 x 9 2/3 Bar with Slot on Top and 2 Finger Hinge on Two Sides Black Part 4318 Element 4160967 or 431826 ×1
  • Sail, 12 x 10 with 7 Holes, Red Flying Dragon Print White Part upn0016pr0002 ×1

Containers 1 piece

  • Barrel 2 x 2 x 2 Brown Part 2489 Element 248925 ×1

String, Bands and Reels 1 piece

  • String Cord Medium Thickness 35cm Black Part 14728c35 Element 74710 ×1

Minifigures 5 figures

  • Knight (Scale Mail on Red) - Black Arms, Light Gray Legs, Dark Gray Neck-Protector Minifigure, checked as a whole figure ×1
  • Knight (Scale Mail on Red) - Blue Arms, Black Legs, Dark Gray Neck-Protector Minifigure, checked as a whole figure ×1
  • Knight (Black Falcon) - Light Gray Legs, Neck-Protector Minifigure, checked as a whole figure ×1
  • Archer (Black Falcon) - Light Gray Legs, Chin-Guard Minifigure, checked as a whole figure ×1
  • Knight (Breastplate on Black) - Black Legs, Neck-Protector 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.

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