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.
Tile 1 x 4 with GrooveDark Bluish GrayPart 2431Element 4211053×4
Tiles Special
4 pieces
Tile Special 1 x 2 Grille with Bottom GrooveFlat SilverPart 2412bElement 4619636×4
Technic Gears
3 pieces
Technic Arm with Gear 8 Tooth and 1.5L AxleLight Bluish GrayPart 24014Element 6134848×3
Bars, Ladders and Fences
1 piece
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki EyeTrans-RedPart 58176Element 6507867 or 6171762×1
Technic Axles
1 piece
Technic Axle 5YellowPart 32073Element 6130008×1
Technic Beams
1 piece
Technic Beam 1 x 4 Thin with Stud ConnectorBlackPart 2825Element 6331570 or 4107136×1
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.
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.