There was a guy here that sold for Paypal but held your BTCs for 7 days before releasing them. I don't know, I guess he would have waited until he withdrew the money to the bank account and then even if a buyer tried at charge back, this wasn't possible since there was no money in the PayPal account.
I don't know is the above possible but this was the only explanation to me why he held coins for 7 days. I don't know is he still active though?
It would probably suspend his PayPal account and force him to use VPNs/proxies/Tor to create new PayPal accounts, even if he had no money. I think it was probably just a misunderstand from his part that chargebacks could only happen from less than a week later. That's not true; it can happen from over months later, even 6 months+.
Yes, maybe he created new PayPal accounts all the times even though I see this as a too much of a hassle. Maybe he chose his customers wisely and this was just a precaution of his, if it happens.
Then again probably nothing of this has worked and he got many chargeback so he has stopped doing it, since he is not anymore around.