You could just say you are selling "A paper wallet with 1BTC in it".
90% of the scammers are people with stolen accounts. If you mail a paper wallet with keyinfo and instructions on how to import/transfer it then you get the advantage of using a verified physical address.
Never done it, but it seems like it would thwart a lot of scammers. People can still lie about not getting it but you could just show a delivery confirmation number and will win the dispute 90% of the time.
People have done this before and still had their PayPal accounts frozen because PayPal explicitly states in their ToS that they won't process transactions for digital currency. There are already many threads on this board posted by people who thought they'd found a "loophole", including someone who shipped paperclips and gave BTC as a "free bonus".
I'm pretty sure that the ToS are also written in a way which says they won't arbitrate disputes over digital currency, too - so there's no incentive for buyers to trust sellers.