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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 (10900) and each piece's element ID, both listed above.
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Duplo Brick 2 x 2
×2
Duplo Brick 2 x 4 Curved Top with Gold Police Badge and White Checked Print
×1
Duplo Figure with Helmet White with Black Front and Badge, Black Legs, Dark Azure Top with Badge and Radio Print (Police)
×1
Duplo Motorcycle with Rubber Wheels, White Handlebars, Windscreen and Headlights Print
×1
Duplo Door / Window Frame Flat Front Surface, Completely Open Back
×1
Duplo Sign Dual Sided with 'Go' on Green Background / 'Stop' on Red Background Print
×1
Duplo Door / Window with Four Equal Square Cornered Panes
×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.
