Originally, I kept them in there boxes and wouldn't even buy or trade for a knife without a box as this went against my system, Then I went online and bought about 5 of these cheap displays. They are large enough to hold about 9 or so knives and still look good. They have real glass fronts with a cheap white cotton susbtance inside. I paid only $4 a peice for them and keep all my knives in them except the few I use as EDC's. I still keep all of there boxes of course in a large box in the closet.
I will most likely use these displays for some time until I can afford a huge wooden wall mounted display case with velvet liner.
For me, I use less than 10% of my knives. So once I recieve one, I decide if its a user or not. IF not, I take it to the sharpmaker for a little touch up, Oil and clean it real good, Then rearrange these cheap displays to accomidate the new purchase.
There are a few members on here that I have seen posted picture of there cases,drawers, and displays. They are unreal. But for now, I will have to go with the $4 alternative.