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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 (10528) and each piece's element ID, both listed above.
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Duplo Support 2 x 3 x 3 with 2 Top Studs
×1
Duplo Brick 2 x 2
×2
Duplo Brick 2 x 3 with Curved Top
×4
Duplo Plate 2 x 8
×1
Duplo Plant, Flower with 1 Top Stud
×1
Duplo Car Base 4 x 8 with Four Black Wheels and Yellow Hubs
×1
Duplo Brick 1 x 2 x 2 with Bottom Tube
×1
Duplo Brick 1 x 2 x 2 with Bottom Tube
×4
Duplo Suitcase / Bag
×2
Duplo Brick 2 x 2
×2
Duplo Plate 2 x 6
×1
Duplo Brick 1 x 2 x 2 with Bus Schedule Print
×1
Duplo Brick 1 x 2 x 2 with Traffic Light Print
×1
Duplo Car Body Bus Small with Blue Floor and Wheel Wells, Headlights and Grille Print (10528)
×1
Duplo Figure with Police Style Hat Red, with Dark Bluish Gray Legs, Blue Jacket with Tie, Smile with Teeth (Train Conductor)
×1
Duplo Figure Child with Cap Red, with Light Bluish Gray Top with Medium Blue Sleeves over Green Shirt with '8' - Nougat Face and Hands - Blue Legs
×1
Duplo Figure Child with Pigtails Reddish Brown, with Medium Blue Jacket over Shirt with Pink Flower - Red Legs
×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.
