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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 (10414) and each piece's element ID, both listed above.
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Duplo Brick 2 x 2 x 2 Curved Top with Pointed Ears, Cat Print
×1
Duplo Brick 2 x 4 x 2 Ears and Pointed Ends with Cat Face Print
×1
Duplo Bed, Bunk
×1
Duplo Brick 2 x 2 x 2 with Alarm Clock Print, Stuffed Bunny on Back Print
×1
Duplo Brick 2 x 2 x 2 with Sun and Clouds Print
×1
Duplo Door with Two Long Window Panes
×1
Duplo Plate 2 x 8
×1
Duplo Brick 2 x 2 x 2 with Bananas Print
×1
Duplo Brick 2 x 2 x 2 with Broccoli, Cut Pear on Back Print
×1
Duplo Door with Two Long Window Panes
×1
Duplo Plate 2 x 8
×1
Duplo Brick 2 x 2 x 2 Curved Top with Round Ears, Sad Bear Print
×1
Duplo Brick 2 x 4 x 2 Rounded Ends with Ears and Bear Face, Black Eyes, Nose, Mouth, Coral Cheeks Print
×1
Duplo Tile 2 x 4 with Wood Grain Pattern
×1
Duplo Brick 2 x 4 x 2 Rounded Ends with Cat Body, Knife and Fork Print
×1
Duplo Brick 4 x 2 x 3 Slope 45°
×2
Duplo Cabinet 2 x 4 x 5
×1
Duplo Chair with no Back / Stool
×2
Duplo Door Frame 2 x 4 x 5
×1
Duplo Plate 8 x 8
×2
Duplo Brick 2 x 4 x 2 Rounded Ends with Bear Body, Book Print
×1
Duplo Brick 4 x 2 x 3 Slope 45°
×2
Duplo Cabinet 2 x 4 x 5
×1
Duplo Door Frame 2 x 4 x 5
×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.
