I just got back into handguns recently...I owned quite a few years ago, and then sold them all but one revolver. Then, in the last couple of years, I've bought, traded, and sold quite a lot. When I had a handgun that I thought was a keeper, one I would never sell or trade, I threw the box away, thinking why keep it?
Well, first thing is, I've learned never to say never.

Second thing is, as someone else mentioned, people do pay more for a box and all the incidentals that come with a new gun. Why is that? I can understand that for a collector's item...but for a common, new model, I wonder why?
Anyway, now I keep the boxes...I have a 10' by 10' storage closet in my home office, and that is where I have my gun safe, ammo, supplies, etc. I keep the boxes in there too.