I was helping my girlfriend in her basement and found a box of shotgun shells she didn't realize were there. They probably date to the 1950s - Remington Kleanbore Nitro Express 16 gauge slugs. It's just a box of 5. I haven't opened it but it feels full.
I know I can drop these off at a police station for disposal, but is there any chance they have collector value? Is there any risk to moving them around (aged gunpowder and primer, y'know.) Is there any legal way to sell them?