Thanks for all the responses everyone. Did anyone else see that revolutionary war wool blanket he has? I'm losing the faith in him a tiny bit. He's selling a wool blanket from the 1700's-1800's for $75 that is in perfect condition. That would be worth thousands if it were really from the revolutionary war era, wouldn't it? The sites I found that make wool reproductions charge several hundred for a 1700's repro. I don't know, just my thoughts.
I can definitely see now how this could be a key. More precisely, a "latch" key. Makes perfect sense. Again, I have been searching for latch-type keys like this and can't find any. I'll keep searching though to see if I can find any similar ones! I know it's a small object, a piece of metal. But if it is actually that old I'll be thrilled with my little piece of metal!
Put it this way, we spent more money ordering pizza tonight than this item cost me. So, like wayward said...it's worth the entertainment alone! I'll probably put a little rope on it and hang it on the kitchen wall or something. Since something this simple is easily made these days, is there a good chance someone could have just forged this in recent years and it just looks old? Is there any way on earth to tell old iron pieces from new ones? Aside from patina. I mean...to me, metal is metal. I don't know anything about it! Thanks for all the help, I learn so much here!