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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 (10901) and each piece's element ID, both listed above.
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Duplo Train Crossing Gate Base / Crane Base with Bottom Hole
×1
Duplo Brick 2 x 3 with Curved Top
×2
Duplo Brick 2 x 2
×1
Duplo Brick Round 2 x 2 x 2
×1
Duplo Brick 2 x 3 with Curved Bottom
×2
Duplo Brick 2 x 4 Curved Top
×1
Duplo Cabinet 2 x 2 x 1.5
×2
Duplo Truck Body, with Fire Logo, Headlights, and Grille Print
×1
Duplo Siren with Light & Sound, 1 x 2 White Base with Red Button
×1
Duplo Animal Cat / Kitten Sitting with Gray Nose and Chest Print
×1
Duplo Car Base 4 x 8 with Four Black Wheels and Yellow Hubs
×1
Duplo Drawer 2 x 2 with Pull Handle
×2
Duplo Plate 2 x 4
×2
Duplo Ladder with Base Locking Ring, Short (Fire)
×1
Duplo Figure with Helmet, Black Legs, Black Jacket with Red Safety Harness, White Helmet with Silver Fire Badge, Green Eyes, Stubble (Firefighter)
×1
Duplo Figure Child, Hair Combed Forward with Curl Reddish Brown, Red Top with White and Medium Azure Undershirt, Zipper and Cords Print, Nougat Face and Hands, Blue Legs
×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.
