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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 (10590) and each piece's element ID, both listed above.
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Duplo Brick 1 x 2 x 2 with Bottom Tube
×2
Duplo Brick 2 x 2
×2
Duplo Brick 2 x 4
×2
Duplo Figure with Police Style Hat Red, with Dark Bluish Gray Legs, Blue Jacket with Tie, Smile with Teeth (Train Conductor)
×1
Duplo Brick 2 x 2 Slope 45°
×1
Duplo Brick 2 x 2 Slope 45° with Octan, Digits and Gas Gauge Print
×1
Duplo Car Body Truck with Lego Logo and Silver Headlights on Front Print
×1
Duplo Hose with Rubber End and Black Nozzle
×1
Duplo Plate 2 x 4
×2
Duplo Brick 1 x 2 x 2 with Bottom Tube
×2
Duplo Brick 2 x 2
×2
Duplo Figure with Construction Helmet Orange, with Orange Vest over Blue Long Sleeve Shirt, Nougat Face and Hands, and Dark Bluish Gray Legs
×1
Duplo Suitcase / Bag
×2
Duplo Airplane Midsize Fuselage Upper with Tail with Airplane Circling Globe
×1
Duplo Brick 2 x 4 x 2 Curved Top with Airplane Circling Globe Print
×1
Duplo Plate 4 x 4
×1
Duplo Car Base 2 x 4 with Fixed Axles - 27.5 Silver Wheels and Black Tires
×2
Duplo Container Wooden-Style Crate
×1
Duplo Wrench with Handles
×1
Duplo Figure Bob / Pageboy Hair Reddish Brown, with Magenta Legs, Medium Blue Top with Necklace
×1
Duplo Airplane Base 12 x 12 x 2.5
×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.
