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.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
Look-alike colors in this set
These parts appear in this set in two colors that are easy to confuse. If you are one short in one color,
check whether it went in where the other color belongs. Each color has its own element ID in the parts list
at the back of the instructions.
Large Figure Skeletal, Limb, Angular with Ball Joint and Ball Socket (Av-Matoran)Black ×4Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Beam 1 x 9 ThickDark RedPart 40490Element 6336739 or 4539283×2
Technic Special
7 pieces
Technic Ball Joint with Through Axle HoleBlackPart 53585Element 4286267×3
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Pearl Light GrayPart 41669Element 4284480 or 4177440×2
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Trans-Neon GreenPart 41669Element 4163577×2
Projectiles / Launchers
2 pieces
Launcher, Large Figure Weapon, Zamor Sphere Launcher, with Hole and Axle HolePearl Light GrayPart 64275Element 4546416×2
Technic Beams Special
2 pieces
Technic Beam 1 x 7 with FanDark RedPart 32177Element 4540570 or 4294362×2
Technic Gears
1 piece
Technic Tread Sprocket Wheel Small with Glatorian Game PrintPearl Light GrayPart 57520pr0001Element 4646781 or 4544529×1
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.