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.
Technic Pin with Friction Ridges Lengthwise and Center SlotsBlackPart 2780Element 4121715 or 278026×2
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×2
Technic Pin Long with Friction Ridges Lengthwise, 2 Center SlotsBluePart 6558Element 4514553×2
Projectiles / Launchers
3 pieces
Projectile, Large Figure Weapon Ammo, Mistika Nynrah Ghost BlasterPearl Dark GrayPart 61811Element 4530802×2
Launcher, Large Figure Weapon, Mistika Nynrah Ghost Blaster Air PumpTrans-BrownPart 61810Element 4525721×1
Technic Bushes
2 pieces
Technic BushLight Bluish GrayPart 3713Element 6275844 or 62718171 spare in the box×2
Bars, Ladders and Fences
1 piece
Bar 4L (Lightsaber Blade / Wand)Trans-RedPart 30374Element 6507880 or 6167284×1
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.