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.
LEGO counts 131 pieces. This inventory comes from a separate parts catalog and lists 142; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.
Before you call it missing
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
Animal, Monkey [Complete Assembly]Reddish BrownPart 2550c01Element 4660881 or 4526876×1
Bricks Sloped
2 pieces
Brick Sloped 45° 2 x 2RedPart 3039Element 303921×2
Flags, Banners and Signs
2 pieces
Flag 2 x 2 Square with Skull and Crossbones (Eyepatch) PrintWhitePart 2335pr0017Element 4221506×1
Flag 6 x 4 with Clips with Skull and Crossbones (Eyepatch) PrintWhitePart 2525pr0011Element 4221502×1
Supports, Girders and Cranes
2 pieces
Support 2 x 2 x 8 with Grooves, Smooth On All Sides, Top PegBlackPart 30646bElement 4222478×1
Hook with TowballDark Bluish GrayPart 30395Element 30395199 or 6347464×1
Plates
1 piece
Plate 2 x 10Reddish BrownPart 3832Element 4211214×1
Technic Steering, Suspension and Engine
1 piece
Towball 1 x 3 Triangle with Two PinsDark Bluish GrayPart 47972Element 4222118×1
Tiles
1 piece
Tile 1 x 4 with GrooveLight Bluish GrayPart 2431Element 4211356 or 2431194×1
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.