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 Chest Badge with 'H' Hero Factory Logo in Spiked CircleTrans-Neon OrangePart 87799Element 4581519×1
Large Figure Head Connector Block (Glatorian)Trans-Neon OrangePart 64262Element 4543426 or 4540702×1
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Trans-Neon OrangePart 41669Element 6111281 or 4163574×3
Orange
3 pieces
Flexible Ribbed Hose 8mm Ends 19LOrangePart 57539Element 4561469 or 4508092×3
Trans-Medium Blue
1 piece
Large Figure Head Connector Block (Glatorian)Trans-Medium BluePart 64262Element 4537503×1
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.