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.
Large Figure Torso Cover, Armor, Small Triangular with Pincer EndPearl GoldPart 87790Element 4569233×1
Large Figure Head Connector Block (Av-Matoran)Trans-Neon GreenPart 60901Element 4565918 or 4516406×1
Large Figure Foot, Small with Axle ConnectorWhitePart 87791Element 4565917×2
Large Figure Shoulder Cover, ArmourWhitePart 43559Element 4565611 or 4194640×2
Large Figure Skeletal, Limb, Angular with Ball Joint, and Ball Socket (Av-Matoran)WhitePart 60899Element 4565915×4
Large Figure Torso Cover, Armor, Small Triangular with Pincer EndWhitePart 87790Element 4565916×1
Technic Axles
2 pieces
Technic Axle 8 with StopDark Bluish GrayPart 55013Element 4499858×2
Technic Connectors
2 pieces
Technic Axle Connector 2 x 3 with Ball Socket, Closed Sides, Squared EndsDark Bluish GrayPart 60176Element 4519225×2
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.
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.