I've read a couple pieces of news about belated mails. Some of them were delivered 30 years after they were sent. I've found them very interesting.
When I went to the U.S. for the first time, and I think it was in 1992, I sent two post cards to my next-door-neighbor sisters. But they never got them. I thought the cards were lost.
Guess what! I got them one year later! I remember the postage for a post card was 40 cents in 1992, but it went up to 50 cents in 1993. The postage was 40 cents on the cards I sent. I was glad the U.S. postmaster didn't ask me to pay more.
I think the reason my mail were delayed was that I didn't know how to drop them into the post-box. It didn't look like our Taiwanese post-box at all. My teacher didn't really know it either. So I pushed the cards into the box's interstice. They must've stayed there for a year until a postman noticed them.
I don't have the cards anymore. But I still remember this interesting story. ^^