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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 (10809) and each piece's element ID, both listed above.
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Duplo Car Body Truck 4 x 4 Flatbed with 2 Top Studs, Grille and Headlights, Police Badge and Blue and White Checked Print
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Duplo Plate 2 x 4
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Duplo Car Base 4 x 8 with Four Black Wheels and Yellow Hubs
×1
Duplo Siren / Flashing Light - Trans-Dark Blue
×1
Duplo Door / Window Frame 4 x 4 x 3 with Thin Top
×1
Duplo Brick 1 x 2 x 2 with Bottom Tube
×2
Duplo Brick 2 x 4 Curved Top with Gold 'BANK' and Pink Piggy Bank Print
×1
Duplo Container Box 2 x 4 x 2 with Open Sides
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Duplo Brick 2 x 2 with Money Print
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Duplo Container Box 2 x 4 x 2 Door with Handle
×1
Duplo Door / Window with Four Equal Square Cornered Panes
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Duplo Brick 1 x 2 x 2 with ATM Screen with '123', Keypad & Lights Print
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Duplo Figure with Police Style Hat Black, with Medium Blue Top with Pockets and Badge, Black Legs
×1
Duplo Figure with Parted Wavy Hair Black, Black and White Striped Top with '92116' (Prisoner)
×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.
