Sent, with the left and right references from the confirmed drawing; the other kit components match twenty kits, so this is specifically ten missing finger sets.

Did stores check for another finger pack inside the sealed outer box?

Yes, all packing checked by two people and retained; no second pack, and the dispatch sheet lists only the twenty individual fingers we received.

Have purchasing ask what changed the accepted kit contents. A dispatch sheet can describe what they packed without changing what you ordered.

Keep the ten complete kits separate from the ten incomplete ones meanwhile.

And make the shortage name left and right quantities too, otherwise they may solve ten missing sets by posting ten more individual fingers

Purchasing has asked for ten left and ten right of the confirmed references, completing the ten missing sets; stores has separated the incomplete kits, thanks Elliot.

Has the seller answered that supply request directly yet?

They now acknowledge the shortage and propose another parcel, but the draft packing list says ten fingers; I have returned it with the required ten matched pairs spelled out again.

There it is. Get that list corrected before the parcel goes.

Ask them to list both references and their quantities, then receiving can check the same thing instead of reopening the meaning of set