Free tool
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 (10829) and each piece's element ID, both listed above.
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Duplo Brick 1 x 2 x 2 with Bottom Tube
×2
Duplo Door / Window Frame Flat Front Surface, Completely Open Back
×1
Duplo Plate 2 x 4
×1
Duplo Brick 2 x 4 x 2 Curved Top with Checkered Flag and Crossed Tools with Mouse Ears Print
×1
Duplo Car Body with Windscreen Frame with White Headlights Print
×1
Duplo Rear Spoiler 2 x 4 x 1 / 2 [Plain]
×1
Duplo Roofpiece Slope 33 4 x 4 with Awning Overhang with 9 Bottom Tubes
×1
Duplo Door / Window with Two Openings and Handle
×1
Duplo Figure Mickey Mouse with Red Overalls
×1
Duplo Brick 2 x 4
×2
Duplo Brick 2 x 2 with 2 Sandwich Halves Print
×1
Duplo Plate 4 x 8
×1
Duplo Wrench with Handles
×1
Duplo Car Base 4 x 8 with Four Black Wheels and Yellow Hubs
×1
Duplo Cone 2 x 2 Square Base
×1
Duplo Brick 1 x 2 x 2 with Drill, Screwdriver, and Wrench Print
×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.
