I stumbled upon this article: How to Cheat eBay Sellers and Scam PayPal | How to,Cheat,eBay,Sellers,Scam,PayPal,editorial,buyers ,abuse,policy,How to Cheat eBay Sellers and Scam PayPal Buyer Protection Policy: An Abuse Editorial by Olin Coles
This seller basically received an empty envelope claim on Paypal from a buyer, and could do nothing about it. Paypal refund the purchase and the case was closed.
What can sellers do to protect themselves from such a claim??