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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.

Hogwarts Castle: Potions Class

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76431 Hogwarts Castle: Potions Class

378 pieces in 114 part and color combinations, plus 4 minifigures.

LEGO counts 397 pieces. This inventory comes from a separate parts catalog and lists 396, including the 18 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

Plates 88 pieces

  • Plate 1 x 5 Dark Bluish Gray Part 78329 Element 6413109 ×1
  • Plate 1 x 1 Dark Tan Part 3024 Element 4549436 or 4497084 1 spare in the box ×4
  • Plate 1 x 2 Dark Tan Part 3023 Element 4528604 or 4497082 ×2
  • Plate 1 x 3 Dark Tan Part 3623 Element 6132768 or 4497086 ×2
  • Plate 2 x 2 Corner Dark Tan Part 2420 Element 4550168 ×4
  • Plate 1 x 1 Light Bluish Gray Part 3024 Element 4211399 1 spare in the box ×15
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×18
  • Plate 1 x 4 Light Bluish Gray Part 3710 Element 4211445 ×3
  • Plate 1 x 6 Light Bluish Gray Part 3666 Element 4211438 ×1
  • Plate 2 x 14 Light Bluish Gray Part 91988 Element 4662161 ×2
  • Plate 2 x 2 Light Bluish Gray Part 3022 Element 4211397 ×1
  • Plate 2 x 2 Corner Light Bluish Gray Part 2420 Element 4211353 ×7
  • Plate 2 x 3 Light Bluish Gray Part 3021 Element 4211396 ×1
  • Plate 2 x 4 Light Bluish Gray Part 3020 Element 4211395 ×4
  • Plate 2 x 8 Light Bluish Gray Part 3034 Element 4211406 ×1
  • Plate 6 x 14 Light Bluish Gray Part 3456 Element 4293831 or 4239371 ×1
  • Plate 1 x 2 Reddish Brown Part 3023 Element 4211150 ×10
  • Plate 1 x 4 Reddish Brown Part 3710 Element 4211190 ×1
  • Plate 1 x 8 Reddish Brown Part 3460 Element 4216945 ×1
  • Plate 2 x 2 Reddish Brown Part 3022 Element 4613975 or 4216695 ×4
  • Plate 2 x 3 Reddish Brown Part 3021 Element 4211189 ×2
  • Plate 2 x 6 Reddish Brown Part 3795 Element 4211247 ×2
  • Plate 2 x 8 Reddish Brown Part 3034 Element 4211211 ×1

Bricks 56 pieces

  • Brick 1 x 1 Dark Bluish Gray Part 3005 Element 4211098 ×18
  • Brick 1 x 3 Dark Bluish Gray Part 3622 Element 4211104 ×4
  • Brick 1 x 1 x 3 Light Bluish Gray Part 14716 Element 6061702 ×3
  • Brick 1 x 2 Light Bluish Gray Part 3004 Element 4211388 ×10
  • Brick 1 x 4 Light Bluish Gray Part 3010 Element 4211394 ×3
  • Brick 1 x 6 Light Bluish Gray Part 3009 Element 4211393 ×5
  • Brick 2 x 2 Corner Light Bluish Gray Part 2357 Element 4211349 ×11
  • Brick 2 x 6 Light Bluish Gray Part 2456 Element 4274668 or 4211795 ×1
  • Brick 1 x 2 Reddish Brown Part 3004 Element 4613963 or 4211149 ×1

Plates Round Curved and Dishes 31 pieces

  • Plate Round 4 x 4 with 2 x 2 Round Opening Black Part 11833 Element 6167800 or 6045912 ×3
  • Plate Round 4 x 4 with Pin Hole Black Part 60474 Element 4515350 ×1
  • Plate Round 1 x 1 with Solid Stud Dark Bluish Gray Part 6141 Element 4210633 1 spare in the box ×13
  • Plate Round 1 x 1 with Solid Stud Medium Nougat Part 6141 Element 6167641 1 spare in the box ×4
  • Plate Round 1 x 1 with Solid Stud Reddish Brown Part 6141 Element 4216581 1 spare in the box ×4
  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 1 spare in the box ×4
  • Plate Round 1 x 1 with Open Stud White Part 85861 Element 6168642 or 4547649 1 spare in the box ×2

Plates Special 31 pieces

  • Plate Special 1 x 2 with Door Rail Dark Bluish Gray Part 32028 Element 4543086 or 4541289 ×1
  • Plate Special Round 2 x 2 with Center Stud (Jumper Plate) Dark Tan Part 18674 Element 6132767 ×4
  • Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] Light Bluish Gray Part 60897 Element 6296894 or 4613956 ×1
  • Plate Special 1 x 2 with Door Rail Light Bluish Gray Part 32028 Element 4211568 ×7
  • Plate Special 1 x 3 with 2 Studs with Groove and Inside Stud Holder (Jumper) Light Bluish Gray Part 34103 Element 6211969 ×2
  • Plate Special 2 x 2 with Only 2 studs Light Bluish Gray Part 33909 Element 6212077 ×1
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Red Part 87580 Element 6126048 or 4581308 ×2
  • Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] Reddish Brown Part 60897 Element 6337003 or 6066142 ×4
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Reddish Brown Part 15573 Element 6092590 ×4
  • Plate Special 1 x 2 with Clip Vertical on End Reddish Brown Part 78256 Element 6459597 ×1
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Reddish Brown Part 87580 Element 4565394 ×4

Bricks Special 29 pieces

  • Brick Special 1 x 2 with 1 Center Stud on 1 Side, Bottom Stud Holder Dark Bluish Gray Part 86876 Element 6473748 ×7
  • Brick Special 1 x 2 with Masonry Brick Profile Dark Bluish Gray Part 98283 Element 6000311 ×14
  • Brick Special 1 x 4 with Masonry Brick Profile Dark Bluish Gray Part 15533 Element 6055310 ×1
  • Brick Special 1 x 1 with Clip Vertical [Open O Clip, Hollow Stud] Light Bluish Gray Part 60475b Element 6345426 or 4533772 ×4
  • Brick Special 1 x 1 with Stud on 1 Side Light Bluish Gray Part 87087 Element 4558953 ×1
  • Brick Special 1 x 2 with 2 Studs on 1 Side Light Bluish Gray Part 11211 Element 6015344 ×1
  • Brick Special 1 x 2 with Vertical Closed Handle on Edge Light Bluish Gray Part 34816 Element 6198932 ×1

Tiles 25 pieces

  • Tile 1 x 1 with Groove Dark Bluish Gray Part 3070b Element 4210848 1 spare in the box ×7
  • Tile 1 x 2 with Groove Dark Bluish Gray Part 3069b Element 4211052 ×1
  • Tile 1 x 4 with Groove Dark Bluish Gray Part 2431 Element 4211053 ×3
  • Tile 2 x 2 Corner Dark Bluish Gray Part 14719 Element 6247784 ×1
  • Tile 1 x 3 Light Bluish Gray Part 63864 Element 4558169 ×2
  • Tile 1 x 2 with Groove Reddish Brown Part 3069b Element 4211151 ×2
  • Tile 1 x 4 with Groove Reddish Brown Part 2431 Element 4211194 ×1
  • Tile 1 x 8 with Groove Reddish Brown Part 4162 Element 4585337 or 4501848 ×1
  • Tile 2 x 2 Corner Reddish Brown Part 14719 Element 6221608 ×4
  • Tile 1 x 2 with Cauldron Print Tan Part 3069bpr0313 Element 6329369 ×3

Bricks Sloped 19 pieces

  • Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version] Dark Bluish Gray Part 15672 Element 6069164 or 4621917 ×12
  • Brick Sloped Inverted 45° 2 x 1 Dark Bluish Gray Part 3665 Element 4211096 ×1
  • 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 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin Light Bluish Gray Part 3040b Element 4211614 ×4

Bricks Round and Cones 17 pieces

  • Brick Round 1 x 1 Open Stud Trans-Clear Part 3062b Element 6514232 or 6223655 ×3
  • Brick Round 2 x 2 x 1 2/3 Dome Top, Hollow Stud Trans-Clear Part 30151b Element 6514278 or 6286876 ×4
  • Brick Round 1 x 1 Open Stud Trans-Green Part 3062b Element 6514234 or 6238046 ×3
  • Brick Round 1 x 1 Open Stud Trans-Light Blue Part 3062b Element 6514238 or 6238677 ×3
  • Brick Round 1 x 1 Open Stud Trans-Red Part 3062b Element 6514235 or 6238673 ×3
  • Cone 1 x 1 [Top Groove] Trans-Yellow Part 59900 Element 6514022 or 6337597 ×1

Tiles Round and Curved 17 pieces

  • Tile 2 x 2 Curved, Macaroni Black Part 27925 Element 6191630 ×4
  • Tile 4 x 4 Curved, Macaroni Dark Bluish Gray Part 27507 Element 6458171 or 6232146 ×6
  • Tile Round 2 x 2 with Bottom Stud Holder Dark Bluish Gray Part 14769 Element 6056296 or 4620079 ×1
  • Tile Round 1 x 1 Quarter Lime Part 25269 Element 6211875 1 spare in the box ×3
  • Tile Round 1 x 1 Opal Trans-Light Blue Part 98138 Element 6514199 or 6299900 1 spare in the box ×3

Bricks Curved 11 pieces

  • Brick Curved 4 x 1 Double, No Studs Dark Bluish Gray Part 93273 Element 4648256 ×6
  • Brick Arch 1 x 4 Light Bluish Gray Part 3659 Element 4211435 ×1
  • Brick Arch 1 x 6 x 2 - Thin Top without Reinforced Underside [New Version] Light Bluish Gray Part 15254 Element 6106189 or 6052784 ×4

Minifig Accessories 11 pieces

  • Equipment Wand [Individual] Black Part 36752a 1 spare in the box ×1
  • Equipment Wand [Individual] Dark Brown Part 36752a 1 spare in the box ×1
  • Equipment Wand [Individual] Dark Tan Part 36752a ×2
  • Equipment Cutlery - Fork Flat Silver Part 79741 Element 6361354 1 spare in the box ×2
  • Equipment Cutlery - Spoon, Flat Bottom Flat Silver Part 80179 Element 6363148 1 spare in the box ×2
  • Equipment Goblet / Glass Pearl Gold Part 2343 Element 4505990 ×1
  • Equipment Bottle / Erlenmeyer / Florence Flask with Trans-Orange Pattern Trans-Clear Part 5608pat0002 Element 6513943 or 6490522 ×1
  • Equipment Bottle / Erlenmeyer / Florence Flask with Trans-Yellow Pattern Trans-Clear Part 5608pat0001 Element 6513942 or 6477295 ×1

Tiles Special 9 pieces

  • Tile Special Round 1 x 1 with Hollow Bar Black Part 20482 Element 6186675 or 6167933 1 spare in the box ×9

Hinges, Arms and Turntables 8 pieces

  • Hinge Plate 1 x 4 Swivel Top / Base - Hollow Clip [Complete Assembly] Light Bluish Gray Part 1927 Element 6416524 ×6
  • Hinge Brick 1 x 2 Base Reddish Brown Part 3937 Element 6186045 or 4541234 ×1
  • Hinge Brick 2 x 2 Top Plate Thin Reddish Brown Part 6134 Element 6167644 or 4541230 ×1

Animal / Creature Body Parts 3 pieces

  • Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Red Part 53451 Element 6270107 or 4568388 1 spare in the box ×3

Energy Effects 3 pieces

  • Smoke / Bubbles with Anti-Stud Trans-Bright Green Part 5533 Element 6512332 or 6490873 ×1
  • Wave / Flame Small with Pin Trans-Orange Part 37775 Element 6514274 or 6357747 1 spare in the box ×1
  • Smoke / Bubbles with Anti-Stud Trans-Purple Part 5533 Element 6512331 or 6475330 ×1

Minifig Headwear Accessories 3 pieces

  • Headwear Accessory Plume / Feather Small with Pin White Part 87693 Element 6406415 or 6139343 2 spares in the box ×3

Plants & Trees 3 pieces

  • Plant, Flower, Minifig Accessory with 7 Thick Petals and Pin, Center Ring White Part 4367 Element 6452532 1 spare in the box ×3

Bars, Ladders and Fences 2 pieces

  • Bar 4L (Lightsaber Blade / Wand) Dark Bluish Gray Part 30374 Element 6378143 or 6353308 ×1
  • Bar 2L with Stop in Center White Part 78258 Element 6357680 1 spare in the box ×1

Containers 2 pieces

  • Minifig Pot Small with Handle Holders Pearl Titanium Part 98374 Element 6363146 or 6153593 ×2

Panels 2 pieces

  • Panel 1 x 4 x 3 [Side Supports / Hollow Studs] Light Bluish Gray Part 60581 Element 6059033 ×2

Technic Bricks 2 pieces

  • Technic Brick 1 x 2 [1 Pin Hole] Light Bluish Gray Part 3700 Element 4211440 ×2

Windows and Doors 2 pieces

  • Window 1 x 2 x 2 2/3 Pane Lattice Diamond with Rounded Top Black Part 30046 Element 6173105 or 3004626 ×1
  • Door 1 x 4 x 6 Round Top with Window and Keyhole, Reinforced Edge Dark Brown Part 64390 Element 6254792 ×1

Animals / Creatures 1 piece

  • Insect, Spider with Elongated Tail Section Medium Nougat Part 29111 Element 6234805 ×1

Minifig Shields, Weapons, & Tools 1 piece

  • Weapon Lightsaber Hilt with Bottom Ring Light Bluish Gray Part 64567 Element 4581155 or 4539481 1 spare in the box ×1

Rock 1 piece

  • Rock - Heart Jewel with Shaft Trans-Dark Pink Part 15745 Element 6240042 or 6058337 ×1

Stickers 1 piece

  • Sticker Sheet for Set 76431-1 [No Color/Any Color] Part 10108493 Element 6485884 ×1

Minifigures 4 figures

  • Professor Severus Snape, Long Robes over Black Vest Minifigure, checked as a whole figure ×1
  • Hermione Granger, Gryffindor Robe Closed, Skirt Minifigure, checked as a whole figure ×1
  • Seamus Finnigan, Gryffindor Robe with Crest, Short Legs Minifigure, checked as a whole figure ×1
  • Pansy Parkinson, Black Robes Minifigure, checked as a whole figure ×1

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

When a piece really is missing

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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

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