For some reason there are a veritable ton of assets that are marked as NPC-owned and they are never on the NPC market. They just perpetually sit as NPC-owned. If they're just normal items, I would suggest picking them up and using them as normal.
I don't think thats possible Arete - they don't show up on the items/party screens, and they don't get assigned to you as carrier when you pick them up (which I suppose is a bug and needs reporting). The best we can do is give you the room number for you to hunt down the items id.