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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.
These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
Trans-Brown ×3
Dark Bluish Gray ×2
Trans-Brown is see-through: hold the piece up to a light.
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
Black ×4
Trans-Brown ×3
Trans-Brown is see-through: hold the piece up to a light.
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
Black ×4
Dark Bluish Gray ×2
Black is darker than Dark Bluish Gray.
LEGO's request form asks for the set number (30455) and each piece's element ID, both listed above.
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Bracket 1 x 2 - 1 x 4 [Rounded Corners at Bottom, Square Corners at Top]
×2
Brick Curved 2 x 1 No Studs [1/2 Bow]
×2
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
1 spare in the box
Also in Trans-BrownAlso in Dark Bluish Gray
×4
Plate 1 x 3
×4
Plate 2 x 3
×2
Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip]
×2
Plate Special 1 x 4 with 2 Studs with Groove [New Underside]
×3
Plate Special 2 x 2 with Groove and Center Stud (Jumper)
×2
Tile 1 x 3
×2
Tile 2 x 3
×2
Tyre 14 x 4 Smooth Small Single [New Style]
×2
Tyre 14 x 9 Smooth Small Wide Slick
×2
Wedge Plate 4 x 4 with 2 x 2 Cutout
×1
Wheel Arch, Mudguard 2 x 4 Studded with Hole
×2
Bar, Angled with 1 x 1 Round Plate / Stud on End
1 spare in the box
×4
Bracket 1 x 2 - 1 x 2 Inverted
×2
Bracket 1 x 2 - 1 x 4 [Rounded Corners at Bottom, Square Corners at Top]
×2
Plate 2 x 4
×2
Plate Special 2 x 2 with Wheels Holder Wide
×2
Plate Special Round 2 x 2 with Center Stud (Jumper Plate)
×1
Wheel 8 x 6 with Slot
1 spare in the box
×2
Wheel 8 x 9 with Hole Notched for Wheels Holder Pin, Re-inforced Back
×2
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
1 spare in the box
Also in BlackAlso in Trans-Brown
×2
Plate 2 x 8
×1
Plate Special 1 x 2 Rounded with 2 Open Studs
×4
Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot]
×2
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
1 spare in the box
Also in BlackAlso in Dark Bluish Gray
×3
Plate 1 x 2
×4
Flame / Headwear Accessory Plume / Feather, Triple Point
1 spare in the box
×3
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.
