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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 (5684) and each piece's element ID, both listed above.
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Duplo Car Base 2 x 4 with Black Tires with Tread & Light Bluish Gray Classic Wheels Design
×2
Duplo Car Body with 2 Studs on Back and Yellow Headlights Print (fits over Car Base 2 x 4)
×1
Duplo Trailer, Four Rear Wheels, Elevated Front End, 4 x 12 Studs with Gate Hinge
×1
Duplo Truck Base with Molded Engine 5 x 9
×1
Duplo Wrench
×1
Duplo Brick 2 x 2
×1
Duplo Trailer Ramp / Door 1 x 4 with Handles
×1
Duplo Truck Semi-Tractor Cab with Dark Bluish Gray Base
×1
Duplo Brick 2 x 2
×1
Duplo Car Transporter Platform
×1
Duplo Brick 2 x 2
×1
Duplo Car Body with 2 Studs on Back and Yellow Headlights Print (fits over Car Base 2 x 4)
×1
Duplo Car Transporter Frame
×1
Duplo Figure with Cap Red, with Tan Top under Blue Coveralls with Red Pocket Flap - Blue Legs
×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.
