Best to keep em
I guarantee that your used gun will have more appeal if it is in the original box and with the paperwork and accessories. Unless the gun is trashed or worn out. And if it is an antique, that might not matter. Most mfr boxes are fine for long term storage if kept in a dry place and closed. They are meant to set on a dealers shelf for months, maybe even years with the original packing, so they are just as good as anything else in normal condx. Not that I do that, but I save boxes. My neighbor got a new Rem. shotgun and took the box and packaging out to the curb immediately. Besides advertising he had a gun, I told him if he had extra attic space, he should save the box for whenever he wanted to sell or trade it in. He did. Plus you don't have to drag around your case at the gunshow after you sell it! Buyer will want something to put it in, not just banging around in the trunk. Yes, boxes are $money$ even if they mean nothing to you. Save em. I lost the box and papers for my cheap Raven from 1982. But in a sale, set two identical cheap Ravens out, one with the box, one with nothing, and see which sells first. I can't understand someone who goes to trade in a gun just months after buying it, minus the box, paperwork, extra mag, accessories, etc. cause they were too lazy to dig them out. They lose money on trade in that way.