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 Beam 1 x 3 ThickBlackPart 32523Element 4142822 or 3252326×2
Technic Beam 1 x 9 ThickBlackPart 40490Element 4645732 or 4542788×2
Technic Beam 3 x 3 T-Shape ThickBlackPart 60484Element 4552347 or 4535771×5
Technic Beams Special
9 pieces
Technic Beam 1 x 3 with Ball Joint in MiddleDark Bluish GrayPart 98577Element 6001085×7
Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes]Light Bluish GrayPart 14720Element 6055519×2
Technic Panels
4 pieces
Technic Panel Fairing #21 5L Small Smooth, Side BTanPart 11946Element 6121107×2
Technic Panel Fairing #22 5L Small Smooth, Side ATanPart 11947Element 6121172×2
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.