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.
Technic Axle Connector 2 x 3 with Ball Socket, Open SidesBlack ×8Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector 2 x 7 with Two Ball Joint SocketsBlack ×2Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector PerpendicularBlack ×10Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Flexible Ribbed Hose 8mm Ends 19LRedPart 57539Element 6055410 or 4609780×2
Technic Bushes
8 pieces
Technic BushLight Bluish GrayPart 3713Element 6275844 or 62718171 spare in the box×6
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedLight Bluish GrayPart 32123bElement 6271165 or 4211573×2
Projectiles / Launchers
3 pieces
Launcher, Large Figure Weapon, Squid Ammo LauncherPearl Light GrayPart 57556Element 4497131×1
Projectile, Large Figure Weapon, Ammo, SquidTrans-OrangePart 57555Element 4511873 or 4500092×2
Bars, Ladders and Fences
2 pieces
Bar 1L with ClipBlackPart 48729aElement 4272218×2
Technic Beams Special
2 pieces
Technic Beam 1 x 2 with Ball Joint AngledDark Bluish GrayPart 50923Element 4503381 or 4289258×2
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.