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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 (10591) and each piece's element ID, both listed above.
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Duplo Train Crossing Gate Base / Crane Base with Bottom Hole
×1
Duplo Plate 2 x 4
×1
Duplo Siren / Flashing Light - Trans-Dark Blue
×1
Duplo Winch Drum Narrow with Black String and Light Bluish Gray Nozzle
×1
Duplo Brick 2 x 2
×1
Duplo Brick 2 x 4
×1
Duplo Boat Base
×1
Duplo Brick 2 x 2
×2
Duplo Brick 2 x 2 Slope 45° with Gauges, Joystick and Buttons Print
×1
Duplo Door / Window Frame Flat Front Surface, Completely Open Back
×1
Duplo Plate 4 x 4
×1
Duplo Brick 2 x 2
×1
Duplo Wave (Fire, Water, Flame) 2 x 1 x 5 with Non-Marbled Tip
×1
Duplo Animal Dog Large Paws with Black Ears and Tail and Spots, Eyes Looking Left Print
×1
Duplo Brick 2 x 2
×1
Duplo Door / Window with Four Equal Square Cornered Panes
×1
Duplo Boat Hull 7 x 12 Top Section with 6 x 8 Deck Studs
×1
Duplo Figure with Fireman Helmet White, and Gray Mustache on Nougat Face and Hands
×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.
