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.
88 pieces in 38 part and color combinations, plus 2 minifigures.
The official piece count includes the 20 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.
LEGO's request form asks for the set number (44021) and each piece's element ID, both listed above.
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Clear every mark for this set?
Piece checklist
Black
39 pieces
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, MediumBlackPart 87747Element 6270091 or 4563477×8
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, SmallBlackPart 53451Element 6270103 or 4568385×1
Large Figure Foot, with Ball Socket 3 x 5 x 2BlackPart 15976Element 6057727×2
Large Figure Foot, with Ball Socket 5 x 6 x 2BlackPart 15367Element 6250300 or 6056379×2
Large Figure Hand Cover, Armor with Handles for ClipsBlackPart 92233Element 6133711 or 4652375×2
Large Figure Head, Jaw with Axle Hole [Plain]BlackPart 15359Element 6056359×1
Large Figure Head, Jaw without Axle HoleBlackPart 15357Element 6056357×1
Large Figure Limb Cover / Claw / Spike Large with AxleBlackPart 15362Element 6297810 or 6269089×3
Large Figure Limb Cover, Size 3, Armor with Ball Joint SocketBlackPart 90641Element 6039134 or 4632609×1
Large Figure Limb Cover, Size 4, Armor with Ball Joint Socket with Blue Spread Wings and Orange Spots Beast PrintBlackPart 90640pr0024Element 6063494×2
Large Figure Skeletal, Limb with Ball Joint and Ball Socket, ShortBlackPart 90612Element 4593557×7
Large Figure Skeletal, Torso with 6 Ball Joints, and 4 Holes, Extra SmallBlackPart 98590Element 4667277×1
Large Figure Skeletal, Torso with 9 Ball Joints, and 6 Holes, MediumBlackPart 90625Element 4593571×1
Large Figure Torso Cover, Armour with 2 Chest Holes and Ball Joint SocketBlackPart 90652Element 4632595×1
Technic Axle Connector 2 x 3 with Ball Socket, Open Lower Axle HolesBlackPart 93571Element 4610948×6
Dark Bluish Gray
12 pieces
Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip]Dark Bluish GrayPart 48729bElement 6278155 or 4579234×2
Large Figure Skeletal, Joint Extender [High Friction]Dark Bluish GrayPart 74261Element 6314448 or 6106472×2
Large Figure Skeletal, Limb with 2 Ball Joints, and Ball SocketDark Bluish GrayPart 90617Element 4622903×4
Large Figure Skeletal, Limb, 4L with Ball Joint on Axle and Ball SocketDark Bluish GrayPart 90611Element 6056934 or 6014009×3
Large Figure Head, Jaw with Axle Hole with 6 Medium Azure Eyes and Black Spots PrintOrangePart 15359pr0001Element 6063309×1
Trans-Neon Green
1 piece
Dish 2 x 2 Inverted [Radar]Trans-Neon GreenPart 4740Element 6245297 or 4112517×1
Trans-Orange
1 piece
Chain 16L [21 Links]Trans-OrangePart 60169Element 6132438 or 6058837×1
Trans-Yellow
1 piece
Weapon Sword with Jagged Edges and Trans Red CenterTrans-YellowPart 11439pat0001Element 6020758×1
Minifigures
2 figures
Evo with DatapadMinifigure, checked as a whole figure×1
Furno in Pearl Dark Gray Armor, Bright Light Blue HeadMinifigure, 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.