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.
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, SmallWhitePart 53451Element 6270106 or 45683871 spare in the box×4
Bars, Ladders and Fences
4 pieces
Bar 1L with ClipBlackPart 48729aElement 4272218×2
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki EyeTrans-Dark BluePart 58176Element 6328198 or 6171763×2
Projectiles / Launchers
3 pieces
Launcher, Large Figure Weapon, Squid Ammo LauncherPearl Light GrayPart 57556Element 4497131×1
Projectile, Large Figure Weapon, Ammo, SquidTrans-YellowPart 57555×2
Technic Beams
2 pieces
Technic Beam 1 x 2 ThinBlackPart 41677Element 6338428 or 4167726×1
Technic Beam 1 x 7 Bent (4 - 4) ThickLimePart 32348Element 6082985 or 4265696×1
Technic Beams Special
1 piece
Technic Beam 1 x 2 with Ball Joint AngledDark Bluish GrayPart 50923Element 4503381 or 4289258×1
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.