@carlsbad2, @tattooedtrackman
I missed the part that the PP address being right - mea culpa. That changes the complexion of everything. Seems to me then, using PP, you're shipping address had better match PP records, regardless of the platform being used for selling...
I always copy and paste the PP address no matter what platform I'm selling on. If there is an issue, I will notify the buyer before shipping and wait for verification that the PP address listed is the address to be used. I've had buyers go into their account right then and there and change their PP address to a new address.
Regardless of who's pointing a finger at who, it sounds like the OPs only hope is the generosity of AG. If it's AG's error, I hope they make things right for you.
If the buyers files a claim with PP, I would think the buyer will win.
Good Luck!