. . . stop alarming the OP with scammers around every corner. As if in 6 months he is going to say there was unauthorised use of his credit card.

the advice given in these forums is for the broader eBay community and not just for the OP.  There would be readers of this thread who are probably wondering the same thing as the OP (without starting a thread or contributing to this one) and reading the responses to guide them in their actions.  If the advice given here is just "He's paid. You've got the money, and the item. Let his friend pick it up, say thank you" and not cautionary in nature then some other members may find themselves posting their own thread and saying something like "I read on these boards some time back that PayPal for pickup was fine and I have just had a chargeback for an item I sold as pickup three months ago . . please help".

Advising that cash on pickup is the best way to go, regardless of the item and value of the item, is sound advice on a forum.