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 4206482×1
Technic Pin 1/2 without Friction RidgesBluePart 4274Element 41430051 spare in the box×4
Light Bluish Gray
4 pieces
Pneumatic T-Piece (T Bar) [New Style]Light Bluish GrayPart 4697bElement 42115081 spare in the box×1
Technic Axle 5Light Bluish GrayPart 32073Element 32073194 or 4211639×1
Technic Axle 7Light Bluish GrayPart 44294Element 44294194 or 4211805×1
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedLight Bluish GrayPart 32123bElement 6271165 or 42115731 spare in the box×1
Dark Tan
2 pieces
Large Figure Hand, Fist with Axle Hole, 4 FingersDark TanPart 93575Element 6154859×2
Trans-Red
2 pieces
Projectile, Spring Shooter Ammunition 8L BarTrans-RedPart 15303Element 6287550 or 6054526×2
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.