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 Axle and Pin Connector Perpendicular 3L with Centre Pin HoleRedPart 32184Element 6276963 or 4128598×2
Technic Pins
5 pieces
Technic Pin with Friction Ridges Lengthwise and Center SlotsBlackPart 2780Element 4121715 or 2780261 spare in the box×2
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 42064822 spares in the box×3
Animal / Creature Body Parts
2 pieces
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, MediumBlackPart 87747Element 6270091 or 45634771 spare in the box×2
Technic Beams Special
2 pieces
Technic Beam 1 x 2 with Ball Joint AngledDark Bluish GrayPart 50923Element 4503381 or 4289258×2
Technic Axles
1 piece
Technic Axle 8 with StopDark Bluish GrayPart 55013Element 4499858×1
Technic Beams
1 piece
Technic Beam 3 x 3 T-Shape ThickDark Bluish GrayPart 60484Element 4552349 or 4535773×1
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.