If you ever crack them out, you'll notice they gave a strong odor to them. The coins, I mean. Smells sort of medicinal. And acetone won't help get rid of it.
Good question. I own everything I post. I once posted a coin in the Follow the lead thread that I didn't own, just to move the thread along. For most coins, I took the images but each year at Fun, some cool friends help me out. I'm getting lazy.