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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 (10961) and each piece's element ID, both listed above.
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Duplo Car Base 2 x 4 with Fixed Axles - 27.5 White Wheels and Black Tires
×1
Duplo Flag Wavy 3 x 4 with Post
×1
Duplo Door / Window with Four Equal Square Cornered Panes
×1
Duplo Door with Two Long Window Panes
×1
Duplo Plate 2 x 4
×1
Duplo Plate 4 x 8
×1
Duplo Airport Tower Wall (Half) with 3 Windows
×2
Duplo Plate 2 x 4
×1
Duplo Turntable 4 x 4 Base, Flush Surface
×1
Duplo Airplane Midsize Fuselage Upper with Tail with Airplane Circling Globe Horizontal Print
×1
Duplo Suitcase / Bag
×1
Duplo Airplane Base 12 x 12 x 2.5
×1
Duplo Animal Bear, Sitting, Black Eyes and Nose Print
×1
Duplo Brick 2 x 2 Slope 45°
×1
Duplo Brick 2 x 4
×1
Duplo Brick 2 x 4 Curved Bottom
×2
Duplo Brick 2 x 4 Curved Top with Airplane Circling Globe, Clouds Print
×1
Duplo Door / Window Frame Flat Front Surface, Completely Open Back
×1
Duplo Door Frame 2 x 4 x 5
×1
Duplo Plate Round 4 x 4
×1
Duplo Chair with no Back / Stool
×2
Duplo Playground Slide Curved Right 90°
×1
Duplo Figure Child with Two Buns on Top and Long Bangs Reddish Brown, with Light Aqua Legs, Pink and White Strips In Heart on Shirt Print
×1
Duplo Figure with Hair Swept Right Reddish Brown, with Black Legs, Shirt with Suspenders Print and Brown Glasses
×1
Duplo Figure with Police Style Hat Dark Blue and Hair, with Dark Blue Legs, Pilot Shirt with Pockets and Red Tie 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.
