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 Lightning, with Marbled Blue and Yellow PatternPearl TitaniumPart 98588pat0002Element 6012440×4
Technic Pins
4 pieces
Technic Pin with Friction Ridges Lengthwise and Center SlotsBlackPart 2780Element 4121715 or 2780261 spare in the box×2
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×2
Tubes and Hoses
4 pieces
Flexible Ribbed Hose 8mm Ends 19LRedPart 57539Element 6055410 or 4609780×2
Flexible Ribbed Hose 8mm Ends 19L with Blue Centre PatternTrans-ClearPart 57539pat0004Element 6044690 or 4614561×2
Projectiles / Launchers
3 pieces
Launcher, Large Figure Weapon, Zamor Sphere Launcher, Bottom with Axle HolePearl TitaniumPart 98564Element 6021670 or 4649272×2
Projectile, Large Figure Weapon, Zamor Sphere / BallYellowPart 54821Element 4545434×1
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.