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.
Large Figure Weapon ClawPearl TitaniumPart 92206Element 4614280×1
Large Figure Weapon Saw, Rotary / CircularPearl TitaniumPart 92205Element 4614325×2
Launcher, Large Figure Weapon, Zamor Sphere Launcher, Bottom with Axle HolePearl TitaniumPart 98564Element 6021670 or 4649272×2
Black
10 pieces
Large Figure Skeletal, Limb with Ball Joint on Axle and Ball SocketBlackPart 90607Element 4593553×2
Large Figure Skeletal, Limb with Ball Joint, and Ball Socket and HoleBlackPart 90616Element 4593562×2
Large Figure Skeletal, Limb, 4L with Ball Joint on Axle and Ball SocketBlackPart 90611Element 4609682×1
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 4610948×2
Technic Pin with Friction Ridges Lengthwise and Center SlotsBlackPart 2780Element 4121715 or 2780261 spare in the box×2
Dark Bluish Gray
2 pieces
Large Figure Skeletal, Limb, 5L with Ball Joint on Axle and Ball SocketDark Bluish GrayPart 90609Element 4618992×2
Lime
2 pieces
Weapon Spike Flexible 3.5LLimePart 64727Element 46168431 spare in the box×2
Bright Green
1 piece
Projectile, Large Figure Weapon, Zamor Sphere / BallBright GreenPart 54821×1
Dark Tan
1 piece
Technic Axle 3 with StudDark TanPart 6587Element 6031821 or 6013821×1
Light Bluish Gray
1 piece
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedLight Bluish GrayPart 32123bElement 6271165 or 42115731 spare in the box×1
Trans-Bright Green
1 piece
Large Figure Head Connector Block (Glatorian)Trans-Bright GreenPart 64262Element 4653135×1
Trans-Clear
1 piece
Flexible Ribbed Hose 8mm Ends 19L with Lime Green Centre PatternTrans-ClearPart 57539pat0002Element 6059315 or 4583980×1
Trans-Neon Green
1 piece
Bar 4L (Lightsaber Blade / Wand)Trans-Neon GreenPart 30374Element 6507881 or 6170186×1
White
1 piece
Large Figure Chest Badge with 'H' Hero Factory Logo on Light Bluish Gray Background PatternWhitePart 98570pat0001Element 6048911 or 6000987×1
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.