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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 (10873) and each piece's element ID, both listed above.
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Duplo Brick 2 x 4 Curved Top with Bow Tie and Balloons Print
×1
Duplo Car Body 4 x 6 x 1 1/2 with Two Studs at Back with Heart Headlights and Grille Print
×1
Duplo Figure Minnie Mouse with Jacket with 4 Buttons Print, and Dark Pink Legs
×1
Duplo Plate 2 x 6
×1
Duplo Brick 2 x 2
×2
Duplo Plate Round Corner 4 x 4
×2
Duplo Brick 1 x 2 x 2 with Gift with Minnie Mouse Ears & Bow Print
×1
Duplo Brick 1 x 2 x 2 with Minnie Mouse and Cat in Yellow Board Print
×1
Duplo Door / Window
×1
Duplo Food Cake with Trans Dark Pink Frosting
×1
Duplo Door / Window Frame Flat Front Surface, Completely Open Back
×1
Duplo Support / Umbrella Stand with Square Base (fits 92002)
×2
Duplo Animal Cat / Kitten Sitting with Yellow Eyes, and Bow on Chest Print
×1
Duplo Car Base 2 x 4 with Fixed Axles - 27.5 White Wheels and Black Tires
×1
Duplo Brick 2 x 2 with Gift with Minnie Mouse Ears & Bow Print
×1
Duplo Chair with 4 Studs and Rounded Back
×1
Duplo Plate 2 x 8
×1
Duplo Flower 4 x 4 x 1 with 4 Top Studs
×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.
