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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.
Checking
32 pieces in 16 part and color combinations.
LEGO counts 31 pieces. This inventory comes from a separate parts catalog and lists 32; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.
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 (2400) and each piece's element ID, both listed above.
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Duplo 2 x 2 x 2 Figure Brick, Spiky Bangs, Red Hair, Suspenders, Freckle Nose Print
×1
Duplo Brick 2 x 2
×5
Duplo Car Base with Red Wheels and Lego Logo Print
×1
Duplo Rotor 3 Blade for Small Helicopter Body (Propeller)
×1
Duplo Brick 2 x 2
×5
Duplo Brick 2 x 4 x 2 Curved Top with Yellow Quarter Circle on Both Sides Print
×1
Duplo Brick 2 x 6 x 2 Rounded Ends with Eyes Print
×1
Duplo Mushroom 2 x 2 Base with Yellow Turtle Shell Print
×1
Duplo Brick 2 x 2
×5
Duplo Brick 2 x 2 x 2 Curved Top with Yellow Propeller / Rotor Holder
×1
Duplo Car Base with Blue Wheels and Lego Logo Print
×1
Duplo Mushroom 2 x 2 Base with Black Spots Print
×1
Duplo Brick 2 x 2
×5
Duplo Brick 2 x 6 x 2 Rounded Ends with Green Circle and Red '2' Print
×1
Duplo Brick 2 x 8 Rounded Ends with Lego Logo Print
×1
Duplo Brick 2 x 2 with Eye, White Dot, White All Around Pupil Print, on Two Sides - Type 2
×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.
