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.
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening]Light GrayPart 32269Element 4141455×1
Technic Pin 1/2 without Friction RidgesLight GrayPart 4274Element 4274021 spare in the box×2
Technic Pin without Friction Ridges LengthwiseLight GrayPart 3673Element 4184166 or 367302×1
Tile Special 1 x 2 Grille with Bottom GrooveLight GrayPart 2412bElement 241202×1
Dark Gray
12 pieces
Technic Axle 3 with StudDark GrayPart 6587Element 4113884 or 658727×4
Technic Pin 3/4Dark GrayPart 32002Element 41098543 spares in the box×8
Orange
1 piece
Technic Beam 3 x 3 L-Shape with Quarter Ellipse ThinOrangePart 32249Element 4144139×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 8008-1[No Color/Any Color]Part 40217Element 4144032×1
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.