What do you mean that the buyers are scammers? The claim they never got the gift cards. Or that the cards had no value?
Either they claim the gc came with $0 (and you're screwed).
Or, in many instances, it's someone who hacked into a PayPal account .
They use their brand new eBay amount, while using an established verified paypal account.
. You ship it to the address on file with eBay, while the item was paid for with someone else's paypal account .
As long as you shipped the gc with tracking, and signature required, PayPal will cover you in that 2nd scenario. But it's a hassle.