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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 (10870) and each piece's element ID, both listed above.
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Duplo Animal Chicken / Hen with Red Comb and Wattle, Semi-Circular Eyes Print
×1
Duplo Animal Cow Baby (Calf) with Semicircular Eyes
×1
Duplo Door / Window Frame Flat Front Surface, Completely Open Back
×2
Duplo Brick 3 x 2 Slope 33°
×2
Duplo Brick 2 x 2 With Hay Print
×1
Duplo Plate 4 x 4
×1
Duplo Animal Cat / Kitten Sitting with Black Eyes and Whiskers and White Chest and Nose Print
×1
Duplo Container Box 2 x 4 (Horse Trough New Style)
×1
Duplo Kettle with Closed Handles 2 x 2 x 1.5
×1
Duplo Shovel / Spade with 'D' Handle
×1
Duplo Plant, Flower with 1 Top Stud
×1
Duplo Door / Window with Four Equal Square Cornered Panes
×1
Duplo Animal Pig, Semi-Circular Eyes Print
×1
Duplo Door / Lid, Wood Effect
×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.
