I love it when that happens! I found a black powder pistol from three months ago in a tub I had never looked through. My friend asked me what I wanted to do with a tub he had in his hands, and I told him I better go through it because I hadn't got around to that one yet. He pulls out a couple of things and I'd tell him to put it in the donate or sell box, depending on what it was. Got down to about two layers of stuff wrapped in paper in the bottom and we both grabbed a piece. Mine was a gold tinted coca cola glass and his was a matching pitcher. I thought that was pretty cool, I'd sell those and make a couple of bucks at a garage sale. Then he moved a few more pieces and he says "Dude, there's a gun in here"! I thought yeah, right. I told him maybe it's a cigarette lighter, because I absolutely did not expect any guns in this particular unit. He kept insisting and pulled it out and said "here, unwrap it". So, I did and it was a Spanish reproduction black powder pistol. Pretty good shape, little minor rust, but looked and functioned fine. Sold it for 75 bucks to another friend!
Moral of the story.....Check your tubs and boxes!