5. I just wonder if this person bought a real lv python bag and then sold a knockoff to me and kept the real one.
this is definitely a possibility. This sounds like a really awful situation. If it turns out to be a replica, the seller may try to claim you are the one trying to pull the switch on them. I am not sure how EBAY deals with a situation like this. Not trying to add to your frustration. It's premature, but maybe call them and tell them the situation while you are waiting for it to be authenticated? Better to be safe.