I currently have them on display inside the Ikea Billy shelf with/without the dust bags. The door has a space in the middle (where the two door meets) that allows the bags to breathe. Our walk in closet is attached to the master bathroom so I am worried about the humidity. Also, if someone broke into my house and saw that the master closet was locked, they might try to break them open since it is obvious that there are valuables in there. I guess there is no perfect answer. I will probably find a cabinet with wooden/opaque doors so that they are not readily visible and move the bags somewhere else and store them when I travel.It's actually really difficult to store your Chanel bags out of view because leather goods need air and they need to breathe. So in dust bag with the top open.
I have a walk-in closet. So I can just lock the closet.
Perhaps you can get cabinets with opaque doors. Close the door when you're out and open the door when you're in the house.