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.
Duplo Boat with 12 Studs and Anchor PrintRedPart dupupn0019pr0001×1
Duplo Brick 2 x 2RedPart 3437Element 4583321 or 343721×1
Duplo Dumper Bucket Large with Sloped EndRedPart 4576×1
Duplo Figure, Early, Hair Bob Brown, Blue Legs, No White in Eyes PrintRedPart 74298pr0065×1
Duplo Figure, Early, Hard Hat White, Blue Legs, Plain Top PrintRedPart 74506pr0003×1
Duplo Figure, Early, with Flat Cap Red, Red Legs, Yellow Life JacketRedPart 4555c02pr0017×1
Duplo Plate 4 x 8RedPart 4672Element 4583743 or 4129965×6
Duplo Railing with Circle OpeningsRedPart 4668×4
Duplo Tipper/Dumper Bucket Hinge PlateRedPart 4577×1
Duplo Winch Drum, Yellow Hook Short with Cross Bar, StringRedPart 4653c02Element 73440×2
Black
5 pieces
Duplo Brick 2 x 2BlackPart 3437Element 4583790 or 343726×3
Duplo Brick 2 x 4BlackPart 3011Element 4513081 or 4290069×2
White
5 pieces
Duplo Boat 12 x 23 DeckWhitePart 4670×1
Duplo Boat Car RampWhitePart 4671×1
Duplo Gas / Fuel / Petrol Pump, WhiteWhitePart dupupn0029c01×1
Duplo Plate 4 x 8WhitePart 4672Element 6109109 or 6016280×2
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.