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.
867 pieces in 365 part and color combinations, plus 3 minifigures.
The official piece count includes the 12 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.
Before you call it missing
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
Look-alike colors in this set
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.
Tile 1 x 2 with Stud Notch LeftWhite ×1Trans-Clear ×1Trans-Clear is see-through: hold the piece up to a light.
Tile 1 x 1 with GrooveDark Turquoise ×1Medium Azure ×1Dark Turquoise is darker than Medium Azure.
Plate 1 x 2Reddish Brown ×2Dark Brown ×6Reddish Brown is redder and lighter than Dark Brown.
Plate 1 x 2Black ×4Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Plate 1 x 3Black ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Plate Special 1 x 1 with Clip Horizontal [Thick Open O Clip]Black ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
3 more look-alike pairs
Plate Special Round 2 x 2 with Center Stud (Jumper Plate)Black ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Wedge Plate 2 x 2 LeftBlack ×3Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Wedge Plate 6 x 3 LeftBlack ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Gear 20 Tooth BevelTanPart 32198Element 6031962 or 4514557×1
Minifig Shields, Weapons, & Tools
2 pieces
Weapon Gun / Blaster 1 x 2 x 2/3 with Studs on Sides and HandleBlackPart 15071Element 6051527×1
Weapon Harpoon [Smooth Shaft]BlackPart 18041Element 62104961 spare in the box×1
Technic Steering, Suspension and Engine
2 pieces
Technic Engine CrankshaftYellowPart 2853Element 6640378 or 4119474×2
Minifig Headwear
1 piece
Hair Small TuftBlackPart 68212Element 63025771 spare in the box×1
Minifig Headwear Accessories
1 piece
Headwear Accessory Plume / Feather Small with PinWhitePart 87693Element 6406415 or 61393432 spares in the box×1
Minifigs
1 piece
Minifig Trophy StatuetteSand GreenPart 90398Element 6335936 or 6138781×1
Stickers
1 piece
Sticker Sheet for Set 21355-1[No Color/Any Color]Part 10111467Element 6528171×1
Tools
1 piece
Brick and Axle Separator v2.0OrangePart 96874Element 6240515 or 4654448×1
Transportation - Sea and Air
1 piece
Tail Shuttle - SmallWhitePart 44661Element 6253365 or 4288960×1
Tubes and Hoses
1 piece
Hose Rigid 3mm D. 25L / 20.0cmBlackPart 75c25Element 6541885×1
Windows and Doors
1 piece
Window 4 x 3 Lattice with Rounded TopDark OrangePart 5260Element 6468833×1
Minifigures
3 figures
Isaac NewtonMinifigure, checked as a whole figure×1
Marie Skłodowska-CurieMinifigure, checked as a whole figure×1
George Washington CarverMinifigure, checked as a whole figure×1
Tick each piece as you find it, or mark it missing.
When a piece really is missing
Ask LEGO
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.
Mark 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.
Keep a record
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.