I'm sorry, but you are making yourself look like an idiot. Do you work for eBay? Are you friends with the buyer? It's no business of yours and again, you have no idea what happened and you don't know the situation.
It's great that you want people to be cautious, but let people decide for themselves. One negative feedback does not deem me a bad seller. That and I cannot control what happens after something leaves my possession, even when it it securely packaged, like this poster was.
I don't know what you do for a living, but I suggest you stick to your day job and stop trying to be private investigator on a Broadway chat board.
If you have anything else to say, please inbox me. Thanks :)