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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 (10823) and each piece's element ID, both listed above.
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Duplo Brick 2 x 2 Slope 45°
×6
Duplo Plate 2 x 4
×2
Duplo Animal Penguin with White and Yellow Chest Print
×1
Duplo Batman Bat-a-Rang / Boomerang
×1
Duplo Batwing Body 10 x 10
×1
Duplo Cannon, Shooting with Axle Hole and Red Firing Button, with Batman Logo Print
×1
Duplo Car Base 2 x 4 with Fixed Axles - 27.5 Yellow Wheels and Black Tires
×1
Duplo Figure with Top Hat (Silkhat), Purple Legs, Vest and Bow Tie, White Hands and Light Nougat Face with Monocle Print (Penguin)
×1
Duplo Brick 2 x 2
×1
Duplo Brick 2 x 3 with Curved Top with Eye Print on Both Sides
×1
Duplo Brick 2 x 4 Curved Bottom
×2
Duplo Cannon Ball 1/2 with Axle Connector and 4 Holes in Top
×2
Duplo Brick 2 x 2
×1
Duplo Figure Batman with Mask / Cowl Blue, with Batman Logo Print
×1
Duplo Plate 4 x 6
×1
Duplo Playground Slide Straight with Two Top Studs
×1
Duplo Cape with Elastic Loop
×1
Duplo Umbrella with Stop Ring
×1
Duplo Plate 2 x 4
×1
Duplo Brick 1 x 2 x 2 with Goblet, Jewelry and Coins 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.
