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 13 ThickBlackPart 41239Element 4522933 or 4164422×4
Technic Beam 1 x 7 Bent (4 - 4) ThickBlackPart 32348Element 6278125 or 4128593×2
Technic Beam 3 x 3 L-Shape with Quarter Ellipse ThinBlackPart 32249Element 6336619 or 4505842×4
Technic Beam 1 x 2 Thick with Pin Hole and Axle HoleLight Bluish GrayPart 60483Element 6265089 or 6004888×4
Technic Beam 1 x 3 ThickLight Bluish GrayPart 32523Element 4211655×2
Technic Panels
7 pieces
Technic Panel Dome 7 x 7 x 5 with Pin HolesBlackPart 57587Element 4512451 or 4508393×1
Technic Panel Fairing # 7 Small Long, Large Hole, Side ABlackPart 32534Element 4501726 or 4157669×1
Technic Panel Fairing # 8 Small Long, Large Hole, Side BBlackPart 32535Element 4501727 or 4157670×1
Technic Panel Fairing #20 Large Long, Small Hole, Side ABlackPart 44350Element 4296202×2
Technic Panel Fairing #21 Large Long, Small Hole, Side BBlackPart 44351Element 4296203×2
Projectiles / Launchers
5 pieces
Launcher, Large Figure Weapon Cannon, Midak Skyblaster with Black Housing [Complete Assembly]Pearl Light GrayPart 62233Element 4521177×1
Projectile, Large Figure Weapon, Zamor Sphere / BallPearl Light GrayPart 54821Element 4494056 or 4291759×4
Technic Bushes
2 pieces
Technic BushLight Bluish GrayPart 3713Element 6275844 or 62718171 spare in the box×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.