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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 (10475) and each piece's element ID, both listed above.
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Duplo Cabin Top 4 x 4
×1
Duplo Front End Loader Bucket with Locking Ring - 7 Teeth
×1
Duplo Hook
×1
Duplo Train Crossing Gate Base / Crane Base with Bottom Hole
×1
Duplo Brick 2 x 2
×2
Duplo Brick 2 x 2
×2
Duplo Plate 2 x 3 with 4 Studs and Reinforced Hinge
×1
Duplo Rock
×1
Duplo Digger Bucket Arm Double with Reinforced Locking Ring
×3
Duplo Dump Truck Bed 4 x 4 x 2 (Tipper)
×1
Duplo Turntable 4 x 4 Base, Flush Surface
×1
Duplo Digger Bucket - Small with Locking Ring - 4 teeth
×1
Duplo Car Base 4 x 8 with Four Black Wheels and White Hubs
×2
Duplo Car Body Digger / Truck 6 x 10 x 3 1/2
×1
Duplo Car Body Truck 4 x 4 Flatbed with 4 Top Studs - Grille and Headlights and Hazard Stripes Print
×1
Duplo Figure with Construction Helmet White and Black Hair, Dark Blue Legs, Safety Vest Print
×1
Duplo Figure with Headset and Cap White, Dark Blue Legs, Safety Vest, Light Nougat Face 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.
