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 Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×2
Dark Bluish Gray
2 pieces
Technic Pin 3/4Dark Bluish GrayPart 32002Element 32002199 or 42110501 spare in the box×2
Light Bluish Gray
2 pieces
Technic Axle TowballLight Bluish GrayPart 2736Element 6443149 or 4211375×2
Pearl Gold
1 piece
Large Figure Weapon Spiked Ball, Thornax Fruit with Black BandPearl GoldPart 64277c01Element 4546585×1
Trans-Medium Blue
1 piece
Large Figure Head Connector Block (Glatorian)Trans-Medium BluePart 64262Element 4537503×1
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.