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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 (10412) and each piece's element ID, both listed above.
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Duplo Brick 2 x 4 Curved Bottom
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Duplo Brick 2 x 2
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Duplo Brick 2 x 4 x 2 Ears and Mane with Horse Face Print
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Duplo Brick 2 x 6 x 2 Curved with 2 x 2 Cutout on Bottom
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Duplo Car Base 2 x 6 with Fake Bolts, Open Hitch End and Yellow Wheels
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Duplo Brick 2 x 2 x 1 1/2 with Curved Top
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Duplo Brick 2 x 2 x 2 Lime with Flex Spring
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Duplo Brick 2 x 4 x 2 Rounded Ends with Ears and Sheep Face Print
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Duplo Brick 2 x 4 x 2 Rounded Ends with Sheep Body, Knitting, Wool Print
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Duplo Car Base 2 x 6 with Fake Bolts, Open Hitch End and Red Wheels
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Duplo Car Base 2 x 6 with Fake Bolts, Open Hitch End and Light Aqua Wheels
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Duplo Brick 2 x 3 with Curved Top
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Duplo Brick 3 x 2 Slope 33°
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Duplo Rear Spoiler 2 x 4 x 1 / 2 [Plain]
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Duplo Brick 2 x 4 x 2 Ears and Pointed Horns with Cow Face Print
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Duplo Brick 2 x 4 x 2 Rounded Ends with Cow Body, Bell Print
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Duplo Brick 2 x 3 x 2 with Curved Top and Bright Light Orange and Medium Azure Spots and Giraffe Face Print
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Duplo Brick 2 x 2
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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.
