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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 (6146) and each piece's element ID, both listed above.
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Duplo Hook
×1
Duplo Support 2 x 3 x 3 with 2 Top Studs
×1
Duplo Figure with Cap Red, with Bright Green Long Sleeve Shirt with Light Orange Collar and Pocket Flaps - Nougat Face with Open Mouth Smile - Dark Bluish Gray Legs
×1
Duplo Plate 2 x 6
×1
Duplo Crane Base 2 x 2 with Hook Holder
×1
Duplo Wrench
×1
Duplo Brick 2 x 2
×2
Duplo Brick 1 x 2 x 2 with Bottom Tube
×2
Duplo Brick 2 x 2 Slope 45° with Oscilloscope Print
×1
Duplo Truck Pickup Flatbed with Dark Bluish Gray Base
×1
Duplo Siren / Flashing Light - Trans-Orange
×1
Duplo Plant, Flower with 1 Top Stud
×1
Duplo Cone 2 x 2 Square Base with White Reflective Safety Stripes Print
×1
Duplo Brick 2 x 4 Curved Top
×1
Duplo Brick 1 x 3 x 2 Round Top, Cut Away Sides with Road Sign with 30 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.
