I just save the delivery confirmation GIF at the same time I print it out, so that's independent (post office) confirmation of the _complete address_, not just the zip code, that the package was delivered to. End-to-end tracking shouldn't be needed, since the point is to prove that the package has _been shipped_, not the exact time of delivery. I've found that calling the buyer _before_ shipment is the best way to make sure everything's legitimate. If they can't be reached at their ebay-listed phone number, then they're already in violation of their ebay member agreement. You can also verify their address and phone number at InfoUSA.