I surmise the reason that Paypal orders the destruction of some of these bags is because of various lawsuits by Hermes and others brands against Paypal. I seem to recall an issue back in the day that PP would make you send the fake bag into one of their locations and apparently these bags were re-appearing on Ebay. I believe the outcome was that PP now has to ensure the bags are destroyed.
PP doesn't want do incur further costs of business so forum boards, experts etc hurt their bottom line. What PP can and should do is have a few levels of review before a claim is decided. I can imagine the amount of claims they get, but it seems as though there is some rote way of handling them with little to no consideration of evidence outside of the "box."
PP may request an affadavit to show that the item has been destroyed.. but there is no guarantee that that item in question has
been destroyed.. hence the "scammer"...
There needs to be a group of knowledgeable authenticators working
for ebay to be able to remove "fakes" when they do appear.. ebay does
have the money to do so they choose not to because as many of us know
they make the money by not removing the fakes...this is a very sad
scenario because the seller was willing to provide the information PP just
never asked for it.. that needs to change...