Are they empty? I used to save a ton of boxes like that, and I finally got disgusted with the space they were taking up and the lack of ability to display them, so I got (borrowed from my wife) a really nice paper cutter and trimmed the bottoms off and put them in 8.5"x11" plastic pages so I could get them in binders. I kept the 4-card panel intact, with a border. (I did have them nested as much as possible as it was, but they still took up more space than I care to think about!)
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).