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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
21 pieces in 17 part and color combinations, plus 1 minifigure.
LEGO counts 21 pieces. This inventory comes from a separate parts catalog and lists 25, including the 4 parts inside the minifigures; 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 (952403) and each piece's element ID, both listed above.
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Brick Sloped 45° 2 x 2
×1
Plate Special 2 x 2 with Wheels Holder Wide [Reinforced Underside Type 2]
×1
Technic Brick 1 x 2 [1 Pin Hole]
×1
Turntable 2 x 2 Plate, Base
×1
Tyre 14 x 4 Smooth Small Single [New Style]
×2
Tile Round 1 x 1
×3
Turntable 2 x 2 Plate - Top
×1
Wheel 8 x 6 with Slot
×2
Cone 4 x 4 x 2 Hollow No Studs
×1
Plate Round 4 x 4 with Pin Hole
×1
Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment]
×1
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole]
×1
Tile Special 1 x 2 Grille with Bottom Groove
×1
Brick Round 2 x 2, Pin Holes
×1
Plate 2 x 6
×1
Technic Axle Pin without Friction Ridges Lengthwise
×1
Tile 1 x 2 with Groove
×1
Construction Worker, Orange Safety Vest, Dark Blue Legs, Red Hard Hat, Goatee
×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.
