So I sold my MtG cards on the internet, and out of 152 auctions I have one buyer claiming no package. He is in Italy, the city of Bologna. I made a mistake and sent the package First Class Int'l which essentially has no tracking/proof, but I figure that there should be some record of his receipt or non-receipt via customs.
Even if I can't access such proof, some ability to represent that it exists might save me from getting hosed. For example: the street address for the international customs office in Bologna, Italy. I tried to Google this up, but my Italian, she'sa not so good.