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 Ball Joint with Through Axle HoleBlackPart 53585Element 4286267×2
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Trans-Neon GreenPart 41669Element 4163577×2
Technic Bushes
3 pieces
Technic BushLight Bluish GrayPart 3713Element 6275844 or 62718171 spare in the box×3
Animal / Creature Body Parts
2 pieces
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, MediumWhitePart 87747Element 6270092 or 46139411 spare in the box×1
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, SmallWhitePart 53451Element 6270106 or 45683871 spare in the box×1
Technic Beams Special
2 pieces
Technic Beam 5 x 5 x 2 Perpendicular Fork 3 FingersDark Bluish GrayPart 19086Element 6102645×1
Technic Beam 3 x 0.5 Liftarm with Boss and Pin Semi-ReducedLight Bluish GrayPart 33299bElement 4563045×1
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.