Artisan Archive

What happens to items in the Bazaar when the auction ends and the item did not sell? I usually do "Instant Sales" in the Bazaar, but I've noticed that the items only stay in there for a max of 7 days regardless. So if my items do not sell within those days, where do they go? Into "Available Items" in the Bazaar? Is it posible to have your "Available Items" filled, and if so, what happens when they are? Or are they "magically" transported back into my inventory? What if my inventory is full?

Availabe items, yes, dont know, dont know, dont know.