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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 (5605) and each piece's element ID, both listed above.
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Duplo Hose with Rubber End and Light Bluish Gray Nozzle
×1
Duplo Trailer Four Rear Wheels, Elevated Front End, 4 x 12 Studs
×1
Duplo Truck Base with Molded Engine 5 x 9
×1
Duplo Container Box 2 x 4 x 2 Door with Handle
×1
Duplo Sound Effects Brick 2 x 4 with Water and Pump Sounds
×1
Duplo Brick 2 x 2
×2
Duplo Brick 2 x 4
×1
Duplo Container Box 2 x 4 x 2 with Open Sides
×1
Duplo Container Tank Lower Section with Outlet for Hose
×2
Duplo Plate 2 x 4
×1
Duplo Container Tank Upper Section with Stripes and Octan Logo Print
×3
Duplo Truck Semi-Tractor Cab with Red Base and Octan Logo Print on Both Doors
×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
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.
