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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.
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73 pieces in 30 part and color combinations.
LEGO counts 67 pieces. This inventory comes from a separate parts catalog and lists 73; 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 (2384) and each piece's element ID, both listed above.
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Duplo Brick 2 x 2
×11
Duplo Brick 2 x 4
×2
Duplo Brick 2 x 6
×1
Duplo Car Base 2 x 6 with Fake Bolts, Open Hitch End and Red Wheels
×1
Duplo Plate 4 x 8
×1
Duplo Propeller / Windmill 8 Blade Fan 6 x 6
×1
Duplo Wagon Body with Sides
×1
Duplo Brick 2 x 2
×12
Duplo Brick 2 x 2 Pin on Side
×1
Duplo Brick 2 x 3 with Curved Top
×2
Duplo Brick 2 x 4
×2
Duplo Brick 1 x 2 x 2 with Wheat and Braided Rope Print
×1
Duplo Brick 2 x 2
×6
Duplo Brick 2 x 4
×3
Duplo Brick 2 x 6
×1
Duplo Car Base 2 x 6 Pullback Motor with Yellow Wheels, Black Tires
×1
Duplo Horse Trough 2 x 4 x 2
×1
Duplo Brick 2 x 2
×5
Duplo Brick 2 x 3 with Curved Top
×2
Duplo Brick 2 x 4
×3
Duplo Brick 2 x 4 x 2 Rounded Ends
×1
Duplo Brick 2 x 6
×1
Duplo Fence 1 x 5 x 1 1/2, Interlocking
×6
Duplo 2 x 2 x 2 Figure Brick, Hair with Cat Ears Light Gray, White Face with Round Eyes and 2 Whiskers Print
×1
Duplo 2 x 2 x 2 Figure Brick, Rounded Bangs, White Head, Red Hair, Red Collar and Heart Buttons, Freckles Print
×1
Duplo 2 x 2 x 2 Figure Brick, White Head, Spiky Bangs, Brown Hair, Brown Dungarees Print
×1
Duplo Animal Cow, Black and White Eyes Print (Old Style)
×1
Duplo Animal Horse/Pony, Black & White Eyes Print
×1
Duplo Animal Pig, Tall, Black and White Eyes (Old Style)
×1
Duplo Animal Sheep, with Black and White Eyes Print (Old Style)
×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.
