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.
Hero Factory Minifigure Arm [2 Clips at 90°]Flat SilverPart 15341Element 6069076×4
Technic Beams
4 pieces
Technic Beam 1 x 2 Thick with Pin Hole and Axle HoleBlackPart 60483Element 6265091 or 6006140×4
Technic Beams Special
4 pieces
Technic Beam 1 x 2 with Ball Joint Straight, Smooth BallDark OrangePart 64276Element 6139208×4
Technic Gears
3 pieces
Technic Arm with Gear 8 Tooth and 1.5L AxleLight Bluish GrayPart 24014Element 6134848×2
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 4514556×1
Hinges, Arms and Turntables
2 pieces
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 9 TeethDark Bluish GrayPart 30553Element 4210695×1
Hinge Cylinder 1 x 2 Locking with 1 Finger and Axle Hole On EndsLight Bluish GrayPart 30552Element 4211679×1
Minifig Shields, Weapons, & Tools
2 pieces
Weapon Scythe / Crescent Blade Serrated with BarBlackPart 98141Element 6270143 or 6039203×2
Bars, Ladders and Fences
1 piece
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki EyeTrans-RedPart 58176Element 6507867 or 6171762×1
Technic Bushes
1 piece
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedLight Bluish GrayPart 32123bElement 6271165 or 42115731 spare in the box×1
Technic Special
1 piece
Technic Ball Joint with Through Axle HoleBlackPart 53585Element 4286267×1
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.