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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 (10857) and each piece's element ID, both listed above.
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Duplo Brick 1 x 2 x 2 with Bottom Tube
×1
Duplo Brick 1 x 2 x 2 with Finish Line, 1, 2 and Timer Print
×1
Duplo Brick 2 x 2 with Black Checkered Print
×4
Duplo Plate 2 x 8
×2
Duplo Brick 2 x 2
×2
Duplo Plate Round Corner 4 x 4
×4
Duplo Car Base 2 x 4 with Black Wheels
×1
Duplo Car Base 2 x 4 with Fixed Axles - 27.5 Black Tires & Red Wheels
×1
Duplo Car Base 2 x 4 with Fixed Axles - 27.5 Black Tires and Dark Bluish Gray Wheels
×1
Duplo Brick 2 x 3 with Curved Top
×2
Duplo Brick 2 x 4 with White 'PISTON CUP' Print
×1
Duplo Brick 2 x 2
×1
Duplo Brick 2 x 4 Curved Top
×2
Duplo Brick 2 x 2
×2
Duplo Car Body 2 Top Studs with Cars Luigi and Silver Side Windows Print
×1
Duplo Trophy Cup with Number 1 in Shield - Closed Handles, Deep Notches
×1
Duplo Car Body 2 Studs on Spoiler with Cars Jackson Storm Print
×1
Duplo Flag Wavy 3 x 4 with Post
×1
Duplo Car Body 2 Top Studs and Spoiler with Lightning McQueen Rust-Eze and Wide Smile Print
×1
Duplo Brick 2 x 2
×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.
