"Malaysia car thieves steal finger" (2005) [0]

These were not casual muggers, since they resorted to kidnapping, also keep in mind that this was done to steal a very valuable car.

With phones also now also becoming wallets, it's not outlandish to think a thief would cut off a finger.

[0] http://news.bbc.co.uk/2/hi/asia-pacific/4396831.stm