Many wall cabinets are now available especially design to display collectibles. These are ideal as the models should be displayed out of the dust. It is amazingly difficult to clean a model once it has experienced the ravages of a dusty, smoky atmosphere. Make sure that the models are displayed out of direct sunlight as the ultra violet can cause the plastics to fade, and the paint to change shade in an alarmingly short period of time. Boxes should also be kept out of sunlight. I keep my boxes made up and stored in a cupboard. However, if you are short of space the boxes can be folded flat but you must be careful to prevent creasing.