Why is having the original box important when you're selling or buying a used body or lens? I read somewhere that it shows that the item isn't stolen, but is that really such a major concern? (It also doesn't prove that the item wasn't shoplifted, "diverted" from normal selling channels, or otherwise lifted while in the box.) Are there other reasons? Is there an assumption that if someone has kept the original box, the equipment has been well taken care of? I'm not trying to be argumentative. I'm really asking. I don't keep my bodies or lenses in their boxes, and I don't have room to store the boxes separately. Have I significantly diminished the resale value of my stuff by tossing the cardboard?