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.
499 pieces in 187 part and color combinations, plus 4 minifigures.
The official piece count includes the 17 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.
Technic Beam 1 x 2 ThickYellowPart 43857Element 4187122×2
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedYellowPart 32123bElement 6271167 or 32123241 spare in the box×2
Technic Knob WheelYellowPart 32072Element 6284189 or 4203493×3
Dark Purple
9 pieces
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)Dark PurplePart 54200Element 4567509 or 42554091 spare in the box×4
Plate 2 x 3Dark PurplePart 3021Element 4225142×1
Tile Special 1 x 2 Grille with Bottom GrooveDark PurplePart 2412bElement 4655690 or 4297453×1
Wedge Plate 3 x 6 Cut CornersDark PurplePart 2419Element 6145665 or 6035469×1
Wedge Plate 8 x 3, 22° LeftDark PurplePart 50305Element 6186465 or 6054801×1
Wedge Plate 8 x 3, 22° RightDark PurplePart 50304Element 6186470 or 6054783×1
Tan
2 pieces
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×2
Dark Orange
1 piece
Tile, Star with Stud Holder, Pin HoleDark OrangePart 11609Element 6167775 or 60356181 spare in the box×1
Dark Tan
1 piece
Technic Axle 3 with StudDark TanPart 6587Element 6031821 or 6013821×1
Orange
1 piece
Brick and Axle Separator v2.0OrangePart 96874Element 6240515 or 4654448×1
Trans-Clear
1 piece
Windscreen 12 x 6 x 6 Curved without Pin HolesTrans-ClearPart 94531Element 6035991 or 4617723×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 70724-1[No Color/Any Color]Part 16055Element 6064412 or 6056961×1
Minifigures
4 figures
Zane in Damaged Techno Robes (Rebooted)Minifigure, checked as a whole figure×1
Nindroid Drone with Neck BracketMinifigure, checked as a whole figure×1
Nindroid WarriorMinifigure, checked as a whole figure×1
Pixal / P.I.X.A.L (Rebooted)Minifigure, 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.