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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 (10415) and each piece's element ID, both listed above.
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Duplo Brick, Hair, 2 x 2 Top Studs, Wavy, Long
×1
Duplo Plate 2 x 4
×1
Duplo Brick 2 x 2 x 2
×2
Duplo Brick, Hair, 2 x 2 Top Studs, Spiked to Side, Spiked Bangs
×1
Duplo Brick 2 x 4 Curved Top with Hoodie Top and Yellow Star and Button Print
×1
Duplo Brick 2 x 3 x 2 with Curved Top
×2
Duplo Brick 2 x 4 Curved Top with Shirt Top with Red Overalls Print
×1
Duplo Brick 2 x 4 Curved Top with Jacket Top and Scarf Print
×1
Duplo Brick 2 x 4 x 2 Rounded Ends with Happy Face, Smile Print
×1
Duplo Plate 2 x 4
×2
Duplo Brick 2 x 2 x 2
×2
Duplo Brick 2 x 4 x 2 Rounded Ends with Sad Face, Crying Print
×1
Duplo Brick 2 x 4 x 2 Rounded Ends with Angry, Dark Pink Cheeks Print
×1
Duplo Brick, Hair, 2 x 2 Top Studs, Spiked to Side, Spiked Bangs
×1
Duplo Plate 2 x 6
×1
Duplo Brick 2 x 4 x 2 Rounded Ends with Very Happy Face, Open Mouth Smile Print
×1
Duplo Brick 2 x 6 x 2 Curved with 2 x 2 Cutout on Bottom
×1
Duplo Brick, Hair, 2 x 2 Top Studs, Straight, Jagged Bangs
×1
Duplo Brick 2 x 4 Curved Top with Sweater Top and Lime Undershirt 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.
