48K boxes.... assuming they're standard copier-paper size boxes of about 9"x11"x18", that's about 50,000 cubic feet of boxes ... and on a single layer, that'd be about 66,000 square feet. If they're full, it's about 192 million pages....
But heck -- let's be generous and knock that down to 20 million pages.
I really have to think it's 48k pages.... But maybe not.