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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.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
LEGO's request form asks for the set number (9660-3) and each piece's element ID, both listed above.
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Duplo Brick 2 x 2
×18
Duplo Brick 2 x 4
×18
Duplo Brick 2 x 2
×9
Duplo Brick 2 x 4
×9
Duplo Brick 2 x 4 x 2 Rounded Ends with 2 Eyes with Pupils Print
×1
Duplo Plate 2 x 4 x 1/2 with 4 Center Studs [Thick]
×4
Duplo Technic Wedge Belt Wheel
×4
Duplo Winch Stand
×3
Duplo Brick 2 x 2
×9
Duplo Brick 2 x 3 with Curved Top
×2
Duplo Brick 2 x 4
×9
Duplo Brick 2 x 8
×2
Duplo Technic Brick 2 x 4 with 3 Holes
×4
Duplo Winch Drum, Yellow Hook Short with Cross Bar, String
×3
Duplo Brick 2 x 8
×4
Duplo Plate 8 x 16
×1
Duplo Tile 2 x 2
×4
Duplo Toolo Brick 2 x 2 with Angled Bracket with Forks and 2 Screws
×2
Duplo Figure Child with Cap Red, with Blue Shirt with 'SKATE' Print - Medium Blue Legs
×1
Storage Bin, Dacta, Medium [New Style]
×1
Duplo Technic Axle 6
×2
Duplo Figure Child with Pigtails Black, with Bright Green Legs
×1
Storage Bin Lid, Dacta [For New Style Trays]
×1
Tick each piece as you find it, or mark it missing.
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.
Request a replacement from LEGOMark 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.
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.
