Our FR10 is already here; this is a separate accessory order for 180 matched fixture-change kits. Sealed box contains too few gripper finger sets. Unnamed Chinese seller says pieces, despite the kit invoice and final per-kit list. What should lead the reconciliation?
Put the final agreed per-kit contents beside the invoice and a checked received inventory. Count complete matching finger sets as well as loose pieces, with identifiers and photographs, so the reviewer can see exactly why the delivered quantity cannot assemble the promised kits.
Keep the as-received packing evidence before reorganising it. You can count complete sets without making a new layout look like the one that arrived. And ask the seller to show their own packing record, not merely repeat their new interpretation of the unit.
Has the seller acknowledged that final contents message as belonging to this order? Keep its date and surrounding confirmation with the request, rather than give them an isolated sentence to discuss without the agreed quantity.
Meanwhile, let stores report complete and incomplete kits separately. The purchasing argument can continue without the setter being handed an apparently complete bag at changeover. Any proposed extra supply later needs the correct matching set identities, not just a total number that looks like it closes the arithmetic.