Their tin anniversary [Prince Charles and Princess Diana's] today has been kicked around by Fleet Street so hard it almost rattles, but millions of Britons and other royal-watchers around the world are wont to hear all the dirt, making publishers of racy newspapers and glossy magazines rich.
2005, Victoria Shannon, "Yahoo, age 10 (!)", The New York Times, 5 March 2005:
In 2005, it is Yahoo that is seizing the marketing momentum and making a big deal out of the so-called tin anniversary.
Tin isn’t a very romantic metal to celebrate a wedding anniversary, but it’s totally appropriate for the 10th year of the largest tin can ever built in space.
The connection to a possible launch is that Apple opened its first two retail stores on that date in 2001; suggesting the Cupertino, Calif.-based company might be planning something special to celebrate its tin anniversary.