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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 (5818) and each piece's element ID, both listed above.
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Duplo Brick 1 x 2 x 2
×5
Duplo Brick 1 x 3 x 2 Round Top with Wheel and Tire Print
×1
Duplo Brick 2 x 4
×1
Duplo Plate 2 x 4
×2
Duplo Plate 2 x 8
×1
Duplo Brick 2 x 2
×2
Duplo Brick 2 x 3
×1
Duplo Roofpiece Slope 33 4 x 4 with Awning Overhang - 3 Short White Stripes Print
×1
Duplo Car Base 2 x 4 with 2 Black Wheels and 2 Black Tires with Silver Hub Print
×1
Duplo Car Base 2 x 4 with Silver Hubs on 4 Tires Print
×1
Duplo Brick 2 x 2
×2
Duplo Car Body Forklift Truck with Cars Guido Print
×1
Duplo Plant, Flower with 1 Top Stud
×1
Duplo Car Body, 2 Top Studs, Compact with Cars Luigi Print
×1
Duplo Plant, Flower with 1 Top Stud
×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.
