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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 (552403) and each piece's element ID, both listed above.
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Bracket 1 x 2 - 1 x 2
×4
Bracket 1 x 2 - 2 x 4
×1
Brick Curved 1 x 2 x 1 1/3 with Curved Top
×2
Brick Curved 2 x 1 No Studs [1/2 Bow]
×1
Brick Round 3 x 4 x 2/3 Triple Curved with 2 Sunk Studs
×1
Brick Sloped 65° 2 x 2 x 2 with Bottom Tube
×2
Brick Sloped Inverted 45° 2 x 2 [Round Hollow Bottom Pin, Bar-sized Stud Holes]
×2
Plate Special 1 x 2 Rounded with 2 Open Studs
×7
Technic Brick 1 x 2 [1 Pin Hole]
×2
Tile Round 2 x 2 with Bottom Stud Holder
×1
Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot]
×3
Brick Round 2 x 2 x 1 2/3 Dome Top, Hollow Stud with Black Eyes Print
×1
Tile Round 1 x 1
×10
Launcher, Plate Special 1 x 2 with Mini Blaster Square
×1
Plate 2 x 2 Corner
×2
Plate 2 x 4
×3
Plate Special 1 x 2 5.9mm Centre Side Towball Socket
×4
Brick Curved Inverted 2 x 1
×1
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)
×1
Plate Special 1 x 2 with 2 End Towballs
×1
Technic Pin with Friction Ridges Lengthwise and Towball - Round Pin Hole
×2
Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot]
×3
Launcher Trigger, Weapon Gun Trigger
×1
Plate Special 1 x 2 with 5.9mm Towball Socket and Towball
×4
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.
