Only if the tracking shows that the item was delivered. I reckon you shouldn't have any problems claiming your money back. If the package ends up at your doorstep in a few weeks, you can simply send the money to the seller again.
I really feel for the seller though. Based on the info you've provided, I think he's just been let down by the postal services. Sea (snail) mail should really be phased out for regular private mail. It was ok back in the 1800's, but not anymore.