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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 (10855) and each piece's element ID, both listed above.
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Duplo Blanket 5 x 6 with White Hearts & Stars Print
×1
Duplo Skirt Satin Layered with Bright Light Blue Peplum, White Heart and Stars Print
×1
Duplo Animal Bird with White Chest and Yellow Beak Print
×1
Duplo Bed 3 x 5 x 1 2/3
×1
Duplo Plate 12 x 12, Rounded Corners with Raised 2 x 2 Center Cylinder
×1
Duplo Brick 2 x 2
×4
Duplo Dish with Pumpkins Print
×1
Duplo Brick 2 x 2
×1
Duplo Gear 4 x 4 - 8 Tooth
×2
Duplo Plate 2 x 6
×5
Duplo Building Roof Spire 3 x 3 x 3
×2
Duplo Building Roof Spire Half 4.5 x 2 x 4
×1
Duplo Cabinet 2 x 2 x 1.5
×1
Duplo Chair with 4 Studs and Rounded Back
×2
Duplo Plate 2 x 4
×1
Duplo Brick 1 x 2 x 2 Brick Effect
×2
Duplo Brick 1 x 2 x 2 with Bottom Tube
×5
Duplo Brick 1 x 2 x 2 with Silver Mirror Print
×1
Duplo Brick 1 x 3 x 2 Round Top, Cut Away Sides with Dark Azure & Silver Clock Face, Dark Pink Clock Hands, with 'C' in Shield Print
×1
Duplo Brick 2 x 10 x 2 Arch
×1
Duplo Brick 2 x 10 x 2 Arch with Ornaments and Shield Print
×1
Duplo Brick 2 x 2
×13
Duplo Brick 2 x 3 with Curved Bottom
×1
Duplo Brick 2 x 4
×1
Duplo Brick Round 2 x 2 x 2 with Rounded Window with Panes Print
×2
Duplo Drawer 2 x 2 with Pull Handle
×1
Duplo Figure with Bright Light Yellow Hair with Tiara, Light Nougat Arms, White Legs, Dark Azure Design Print (Cinderella)
×1
Duplo Figure with Thick Hair Combed Forward, with Gold Details on Shirt, Dark Blue Legs, White Hands (Prince)
×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.
