When credit cards were first introduced into Australia, they were merely posted to everyone without asking. It was very obvious what they were, so I'm sure many were stolen.
In 2002 when I told my local post office manager that letters were coming to me at all sorts of odd times and were opened, he said that mail was being stolen from boxes, and a lot were discovered in a pile under a bush. I therefore rented a post office box. It was inconvenient to go a kilometre to collect my mail, but whenever I was away or in hospital, I felt comfortable that nothing was being taken. If the box became too full, the manager would tie everything up and keep it aside.