Lost Property Office
Found off of the Street of Cunning Artificers.
Here, a player may turn in lost items they have found (except those registered to that player), or look to see if someone has turned in an item they have lost. Of course, this means they can also register their items as belonging to them, there, for a cool 5$ apiece.
Items newly registered have a mark on them that identifies the item as being registered. Old registered items can be marked at no cost by showing it at the Lost Property Office.