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 (44010) and each piece's element ID, both listed above.
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Piece checklist
White
20 pieces
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, LargeWhitePart 11089Element 6636362 or 6015883×3
Arm Mechanical with Clip [Thick Support]WhitePart 98313Element 6976864 or 6276864×4
Large Figure Chest Badge with 'H' Hero Factory Logo on Light Bluish Gray Background PatternWhitePart 98570pat0001Element 6048911 or 6000987×1
Large Figure Foot, Type 2WhitePart 90661Element 4632583×2
Large Figure Hand, Fist with Axle Hole, 4 FingersWhitePart 93575Element 6134192 or 4610918×2
Large Figure Limb Cover, Armour with SpikesWhitePart 11334Element 6024523×2
Large Figure Limb Cover, Size 3, Armor with Ball Joint SocketWhitePart 90641Element 6045952 or 4632612×2
Large Figure Limb Cover, Size 5, Armor with Ball Joint SocketWhitePart 90639Element 4632643 or 4610453×2
Large Figure Mask, StormerWhitePart 11278Element 6020163×1
Large Figure Weapon Accessory, Flame / Lightning Bolt with Axle Hole with Marbled Trans-Light Blue PatternWhitePart 11302pat0003Element 6266807 or 6029783×1
Black
14 pieces
Large Figure Skeletal, Limb with Ball Joint, and Ball Socket and HoleBlackPart 90616Element 4593562×2
Large Figure Skeletal, Limb, 5L with Ball Joint on Axle and Ball SocketBlackPart 90609Element 4593555×2
Large Figure Skeletal, Torso with 9 Ball Joints, and 6 Holes, MediumBlackPart 90625Element 4593571×1
Technic Axle Connector 2 x 3 with Ball Socket, Open Lower Axle HolesBlackPart 93571Element 4610948×1
Technic Axle and Pin Connector Angled #1BlackPart 32013Element 6284699 or 4107085×4
Technic Axle and Pin Connector Angled #5 - 112.5°BlackPart 32015Element 6271346 or 4107084×2
Technic Axle and Pin Connector PerpendicularBlackPart 6536Element 6261371 or 4173668×1
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleBlackPart 32184Element 6276951 or 4121667×1
Trans-Light Blue
8 pieces
Large Figure Helmet / Visor with Clip with Face Guard Print Type 3Trans-Light BluePart 11269pr0002Element 6033126×1
Large Figure Limb Cover, Size 4, Armor with Ball Joint SocketTrans-Light BluePart 90640Element 6139209 or 6029235×3
Plate Round 1 x 1 with Solid StudTrans-Light BluePart 6141Element 6514058 or 62402251 spare in the box×4
Flat Silver
7 pieces
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, SmallFlat SilverPart 53451Element 6270108 or 46129011 spare in the box×4
Large Figure Shield, Type 2Flat SilverPart 92202Element 4667792×1
Large Figure Torso Cover, Armour with 4 HandlesFlat SilverPart 11271Element 6016208×1
Large Figure Weapon Blade, Curved Tip with AxleFlat SilverPart 11305Element 6350510 or 6016238×1
Large Figure Shield / Weapon with Half 'H'Pearl TitaniumPart 11273Element 6016212×1
Technic Axle Connector 2 x 3 QuadruplePearl TitaniumPart 11272Element 6251539 or 6022718×1
Blue
1 piece
Technic Pin Long with Friction Ridges Lengthwise, 2 Center SlotsBluePart 6558Element 4514553×1
Trans-Dark Blue
1 piece
Large Figure Head with HandleTrans-Dark BluePart 11270Element 6029158×1
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