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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 (10419) and each piece's element ID, both listed above.
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Duplo Chair with no Back / Stool
×2
Duplo Plate 2 x 4
×1
Duplo Brick 1 x 2 x 2 with Honey Jar, Dripper, and Mug Print
×1
Duplo Fence/Bench 2 x 4
×2
Duplo Brick 1 x 2 x 2 Brick Effect
×2
Duplo Plant, Flower with 1 Top Stud
×1
Duplo Truck Body, with License Plate '833ZZ', Headlights, and Grille Print
×1
Duplo Brick 3 x 2 Slope 33°
×2
Duplo Brick 2 x 2 with Jars of Honey Print
×1
Duplo Car Base 4 x 8 with Four Black Wheels and White Hubs
×1
Duplo Animal Bee with Face and Black Stripes Print
×2
Duplo Figure Child, Hair Combed Forward with Curl Dark Orange, Bright Green Legs, Jacket with Pockets and Zipper Print
×1
Duplo Figure with Curly Hair Light Bluish Grey, Blue Overall, Flowers, Bee Print
×1
Duplo Watering Can
×1
Duplo Plant, Flower with 1 Top Studs
×1
Duplo Brick 2 x 2
×1
Duplo Brick 1 x 2 x 2 with Bees and Honeycomb 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.
