Originally Posted by Martian

Since he's paying through paypal, this won't be a money order scam, but it's still a scam.

This one is called a Reverse Scam. Basically, the buyer gets you to ship the item, then reverses the payment by claiming either the item was never received or that it was damaged.

If you ship certified with a tracking number you might be able to avoid it, but personally I'd just walk away. It's possible this guy is honest, but from where I'm sitting it doesn't look particularly likely.