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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.

Mystery Box 3 - Space

Checking

MYSTERYBOX-3 Mystery Box 3 - Space

65 pieces in 35 part and color combinations.

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 Wedged 14 pieces

  • Wedge Plate 4 x 4 Cut Corner Black Part 30503 Element 4160025 ×2
  • Wedge Plate 3 x 2 Left Blue Part 43723 Element 4498156 or 4280150 ×2
  • Wedge Plate 3 x 2 Right Blue Part 43722 Element 4498155 or 4280149 ×2
  • Wedge Plate 3 x 3 Cut Corner Light Bluish Gray Part 2450 Element 4211361 ×2
  • Wedge Plate 8 x 3, 22° Left Light Bluish Gray Part 50305 Element 4258275 or 4228302 ×1
  • Wedge Plate 8 x 3, 22° Right Light Bluish Gray Part 50304 Element 4258273 or 4228300 ×1
  • Wedge Plate 2 x 2 Cut Corner Yellow Part 26601 Element 6195184 ×4

Bricks Curved 11 pieces

  • Brick Curved 3 x 1 No Studs Blue Part 50950 Element 4543998 ×2
  • Brick Curved 4 x 1 Double, No Studs Blue Part 93273 Element 4649773 ×2
  • Brick Curved 2 x 1 No Studs [1/2 Bow] Dark Blue Part 11477 Element 6554198 or 6094143 ×2
  • Brick Curved 2 x 2 with Lip, No Studs Trans-Brown Part 30602 Element 6507872 or 6171717 ×1
  • Brick Curved 3 x 1 No Studs Yellow Part 50950 Element 4247771 ×2
  • Brick Curved 4 x 1 Double, No Studs Yellow Part 93273 Element 4613151 ×2

Bricks Special 8 pieces

  • Brick Special 1 x 1 with Stud on 1 Side Blue Part 87087 Element 4583862 ×4
  • Brick Special 1 x 1 with Stud on 1 Side Yellow Part 87087 Element 4624985 ×4

Plates 8 pieces

  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×2
  • Plate 2 x 6 Light Bluish Gray Part 3795 Element 4211452 or 3795194 ×1
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×1
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×1
  • Plate 2 x 3 Yellow Part 3021 Element 302124 ×2
  • Plate 2 x 4 Yellow Part 3020 Element 302024 ×1

Bricks Sloped 6 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Dark Blue Part 54200 Element 4504374 or 4502092 ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Yellow Part 54200 Element 6245272 or 4260942 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin Yellow Part 3040b Element 4121965 or 304024 ×2

Plates Special 5 pieces

  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Blue Part 15573 Element 6092582 ×1
  • Plate Special 1 x 4 with Angled Tubes Flat Silver Part 61072 Element 4632100 ×1
  • Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment] Light Bluish Gray Part 3839b Element 4211464 ×1
  • Plate Special 1 x 2 with Clip Horizontal on End Yellow Part 63868 Element 6347284 or 4535740 ×2

Tiles Special 4 pieces

  • Tile Special 1 x 1 with Clip with Rounded Edges Black Part 15712 Element 6335388 or 6066102 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Flat Silver Part 2412b Element 4619636 ×2

Bricks Round and Cones 3 pieces

  • Brick Round 2 x 2 Truncated Cone Black Part 98100 Element 4653822 ×1
  • Cone 1 x 1 [Top Groove] Trans-Yellow Part 59900 Element 6514022 or 6337597 ×2

Bars, Ladders and Fences 2 pieces

  • Bar 3L Light Bluish Gray Part 87994 Element 6093527 or 6064033 ×2

Minifig Shields, Weapons, & Tools 2 pieces

  • Weapon Sword, Big Blade with Bar Flat Silver Part 98137 Element 6378729 or 6270132 ×2

Tiles Round and Curved 2 pieces

  • Tile Round 1 x 1 Trans-Yellow Part 98138 Element 6514193 or 6274740 ×2

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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