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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.

BOOMTOWN BUILD Discovery Set

Checking

45812 BOOMTOWN BUILD Discovery Set

78 pieces in 22 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

Medium Azure 14 pieces

  • Duplo Brick 1 x 2 x 2 Brick Effect Medium Azure Part 25550 Element 6172452 ×8
  • Duplo Brick 2 x 2 Slope 45° Medium Azure Part 6474 Element 6172514 ×6

Yellow 9 pieces

  • Duplo Brick 2 x 4 Yellow Part 3011 Element 4290060 or 301124 ×5
  • Duplo Fence Railing 1 x 6, with 6 Posts Yellow Part 12602 Element 6036418 ×2
  • Duplo Plate Special 4 x 6 with Studs on Edge Yellow Part 31465 Element 4143157 ×2

Blue 7 pieces

  • Duplo Brick 2 x 4 Blue Part 3011 Element 4290075 or 301123 ×5
  • Duplo Plate 4 x 8 Blue Part 4672 Element 6063473 or 4541331 ×2

Red 7 pieces

  • Duplo Brick 2 x 4 Red Part 3011 Element 4583326 or 4290074 ×5
  • Duplo Figure Child with Ponytails and Bangs Black, Red Top with Rocket Ship Print - Nougat Face and Hands - Dark Azure Legs Red Part 18825pr0032 Element 6255022 ×1
  • Duplo Figure Child, Hair Combed Forward with Curl Black, Red Top with Rocket Ship Print - Nougat Face and Hands - Dark Azure Legs Red Part 18823pr0010 Element 6233698 or 6136449 ×1

Green 5 pieces

  • Duplo Brick 2 x 4 Green Part 3011 Element 4290071 or 301128 ×5

Light Bluish Gray 5 pieces

  • Duplo Brick 2 x 2 Slope 45° Light Bluish Gray Part 6474 Element 4222193 ×4
  • Duplo Figure Child with Cap Lime, with Light Bluish Gray Sweater and Tie over White Shirt - Dark Brown Face - Blue Legs Light Bluish Gray Part 47511wpr0006 Element 6233834 or 6100839 ×1

Medium Blue 5 pieces

  • Duplo Brick 2 x 4 Medium Blue Part 3011 Element 4290088 or 4167177 ×5

Orange 5 pieces

  • Duplo Brick 2 x 4 Orange Part 3011 Element 4290078 or 4158403 ×5

Black 4 pieces

  • Duplo Train Crossing Gate Base / Crane Base with Bottom Hole Black Part 13358 Element 6036717 ×4

Bright Green 4 pieces

  • Duplo Plate 2 x 5 with 8 Studs and Hinge Bright Green Part 16686 Element 6211346 ×4

Dark Bluish Gray 4 pieces

  • Duplo Brick 2 x 2 Dark Bluish Gray Part 3437 Element 4583792 or 4583551 ×4

Reddish Brown 4 pieces

  • Duplo Brick 2 x 4 Curved Top Reddish Brown Part 98223 Element 4644207 ×4

Bright Light Orange 2 pieces

  • Duplo Flag Wavy 3 x 4 with Post Bright Light Orange Part 31925 Element 6185103 ×2

White 2 pieces

  • Duplo Plate 2 x 6 White Part 98233 Element 6059082 ×2

Bright Pink 1 piece

  • Duplo Figure Child with Ponytails and Bangs Yellow, with Dark Azure Legs, White and Pink Top with Bee Print Bright Pink Part 18825pr0024 Element 6250094 ×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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