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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 (10941) and each piece's element ID, both listed above.
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Duplo Train Front, Steam Engine with Cow Catcher with Red Mickey Mouse with '1' and Gold Stars and Stripes with Rivets Print
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Duplo Brick 2 x 2
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Duplo Brick Round 4 x 4 Dome Top with 2 x 2 Studs - Marbled White 'Frosting'
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Duplo Musical Instrument Guitar
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Duplo Balloons
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Duplo Brick 2 x 2 with Red '2' Print
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Duplo Brick 2 x 2 with Medium Azure '5' Print
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Duplo Brick 2 x 2 with '3' Print
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Duplo Brick 2 x 2 with '1' Print
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Duplo Brick 2 x 2 with Mickey Mouse Silhouette and Ribbon with Bow (Gift) Print
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Duplo Cupcake / Muffin Cup with 2 x 2 Studs
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Duplo Car Base 2 x 6 with Fake Bolts, Open Hitch End and Yellow Wheels
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Duplo Skirt Satin with White Large Polka Dots Print
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Duplo Train Cabin 3 x 3 x 3 1/2 Large Side Windows [Plain]
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Duplo Brick 1 x 2 x 2 with Gift with Minnie Mouse Ears & Bow Print
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Duplo Candle with Yellow Flame Print
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Duplo Brick 2 x 2 with Bright Light Yellow '4' Print
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Duplo Car Base 2 x 6 with Fake Bolts, Open Hitch End and Red Wheels
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Duplo Figure Mickey Mouse with Black Jacket and Yellow Bow Tie - Red Trousers
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Duplo Figure Minnie Mouse with Red Swimsuit Print, and Black Legs
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Duplo Figure Dog Pluto
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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.
