I found some items that are NPC Market owned on my hunting travels.
Having found some old threads from Year 12 and 13 it would perhaps be that these items were previously owned by a player that has now deceased. In one thread the items were made over to the person who was carrying them, and in the second thread it appears that the person was told that they would eventually be sold.
In this situation the items are not worth all that much in credit value so is there a process to have them made over to me if I provide my backpack ID which is where I am storing them?
If they are owned by the NPC Market, then they are just that. You can try to buy them off the NPC market by placing your bid on them in a commerce centre or trading station, that is owned by a trading faction.