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.
811 pieces in 262 part and color combinations, plus 5 minifigures.
The official piece count includes the 19 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 GrooveTan ×3Light Nougat ×2Tan is yellower and darker than Light Nougat.
Tile 2 x 6Black ×1Dark Blue ×1Black is yellower and darker than Dark Blue.
Technic Gear Rack 1 x 4Light Bluish GrayPart 3743Element 6457283 or 4211450×2
Technic Pins
3 pieces
Technic Pin 1/2 with FrictionDark Bluish GrayPart 89678Element 63956351 spare in the box×3
Bricks Wedged
2 pieces
Brick Wedged, Curved 3 x 2 with Stud Notch LeftBright Light OrangePart 80177Element 6398304×1
Brick Wedged, Curved 3 x 2 with Stud Notch RightBright Light OrangePart 80178Element 6398305×1
Windscreens and Fuselage
2 pieces
Windscreen 3 x 6 x 1 Curved with Rectangular Stud Holder in BottomTrans-ClearPart 35299Element 6507938 or 6246850×1
Windscreen 6 x 9 x 1 2/3Trans-ClearPart 1874Element 6395529×1
Animals / Creatures
1 piece
Animal, Cat, Chubby with Orange Spots, Olive Green Eyes, Grumpy Print (Churro)WhitePart 2652pr0001Element 6435013 or 6428858×1
Stickers
1 piece
Sticker Sheet for Set 41729-1[No Color/Any Color]Part 10101083Element 6416440×1
Technic Axles
1 piece
Technic Axle 4 with StopDark Bluish GrayPart 87083Element 6083620 or 4560177×1
Tools
1 piece
Brick and Axle Separator v2.0Dark TurquoisePart 96874Element 6254100×1
Minifigures
5 figures
Leo - Lime Shirt, Coral PantsMinifigure, checked as a whole figure×1
Jordin - Bright Light Orange OverallsMinifigure, checked as a whole figure×1
IsaacMinifigure, checked as a whole figure×1
AlbaMinifigure, checked as a whole figure×1
Autumn - Dark Green Top, Olive Green ShortsMinifigure, 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.