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.
LEGO's request form asks for the set number (6201) and each piece's element ID, both listed above.
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Piece checklist
Large Buildable Figures
29 pieces
Large Figure Foot, Claw with Ball Socket, Rounded EndsBlackPart 74699Element 6012850×2
Large Figure Limb Cover, Armor, ShoulderBlackPart 90650Element 4609820×2
Large Figure Limb Cover, Size 3, Armor with Ball Joint SocketBlackPart 90641Element 6039134 or 4632609×3
Large Figure Shoulder Cover, Armour, RoundedBlackPart 98571Element 4652142×2
Large Figure Skeletal, Connector, Perpendicular, 3L with 2 Pins, 3 Ball Joints on AxleBlackPart 90634Element 4593579×1
Large Figure Skeletal, Limb with Ball Joint and Ball Socket, ShortBlackPart 90612Element 4593557×1
Large Figure Skeletal, Limb, 5L with Ball Joint on Axle and Ball SocketBlackPart 90609Element 4593555×4
Large Figure Skeletal, Torso with 9 Ball Joints, and 6 Holes, MediumBlackPart 90625Element 4593571×1
Large Figure Skeletal, Limb with 2 Ball Joints, and Ball SocketDark Bluish GrayPart 90617Element 4622903×2
Large Figure Mask, Toxic ReapaLimePart 98579Element 4652152×1
Large Figure Skeletal, Limb with 2 Ball Joints, and Ball SocketLimePart 90617Element 4652388×2
Large Figure Skeletal, Limb, 4L with Ball Joint on Axle and Ball SocketLimePart 90611Element 4652387×1
Large Figure Limb Cover, Size 3, Armor with Ball Joint SocketTrans-Neon GreenPart 90641Element 6061058 or 4652389×6
Large Figure Chest Badge with 'H' Hero Factory Logo on Light Bluish Gray Background PatternWhitePart 98570pat0001Element 6048911 or 6000987×1
Bricks Round and Cones
4 pieces
Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle HolderLimePart 30367b×2
Brick Round 2 x 2 x 2 Robot Body, Axle Holder '+' OrientationLimePart 30361cElement 4655089 or 4550627×2
Technic Connectors
3 pieces
Technic Axle Connector 2 x 3 with Ball Socket, Open Lower Axle HolesDark Bluish GrayPart 93571Element 6287965 or 4626667×2
Technic Axle Connector 2 x 3 with Ball Socket, Open Lower Axle HolesTrans-Neon OrangePart 93571Element 4652396×1
Energy Effects
2 pieces
Wave / Flame Rounded Large with Marbled Green PatternTrans-GreenPart 85959pat0004Element 4615113×2
Technic Pins
2 pieces
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 42064821 spare in the box×2
Tubes and Hoses
2 pieces
Flexible Ribbed Hose 8mm Ends 19L with Lime Green Centre PatternTrans-ClearPart 57539pat0002Element 6059315 or 4583980×2
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
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pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.