I never knew that Paypal FF is irreversible. I am sorry for your lose. You should not send FF first neither the scammer too. When a user do not have much rep here, it's always advisable to use escrow.
Archive:
http://archive.is/xnrWNI will tag the guy and I hope he leaves this kind of scamming profession.
Edit:
Tagged
PayPal friends/family is not irreversible, however most of the time once a payment is sent, it cannot be reversed. In certain situations, for example when a payment is sent from a new country/IP that makes it obvious that the payment was not authorized by the account owner, only then will PayPal consider reversing it.
Paypal can be reversed for any types of payment and it can be for various payment. For example:
1. If it has been paid via credit card and the person asked for a chargeback by saying lost/hack credit card.
2. If the person send you the fund by changing his IP and say my account has been hacked. So chargeback will happen. If people ask to prof the way of fnf with the sender you would be able to provide no information so it will be reversed.
3. If the fund of the sender's account came from a hacked/stolen credit card.
4. If the fund of the sender's account came from a hacked/stolen Paypal account.
There might have a manymore reason.