I recently sold an expensive card and had to ship it to PSA for authentication. I opted for registered mail insured to full value. If something goes wrong with that, people get fired, even if the item turns up. I once had a T206 Cy Young go missing for a few days. It had been shipped to me registered. The carrier did not knock on my door to deliver it the first time and left a note that it would be at the PO that handles registered mail. I got there and no package. The postmaster was really concerned. Turned out that the carrier didn't check it back in that night but instead just left it in the truck for redelivery. The postmasters at two offices (the registered one and the main Burbank PO) were on it immediately and the carrier got fired for breaching registered mail policy. So when I had to get a really expensive card to Santa Ana, I went with registered, even though it cost me 3x the shipping I collected on the sale; worth every dime for my peace of mind. Deal went without a snag.
Oh, and the thread needs a card, so heres the T206 in question:
