Foxworth said the longest spree he has seen in his career from a single thief was a two-year string of more than 40 bank robberies. That robber, known as the FedEx thief for sometimes carrying a FedEx envelope as a prop into banks and filling it with cash, ended in 2005 with the arrest of Farhad Farhbaksh near the U.S.-Mexico border. Farhbaksh was sentenced to 34 years in prison in 2006.
FBI agent Rob Rice in Chicago told ABC news that naming criminals with monikers is a practice that makes them more easily identifiable, especially to the media.
"We have over 200 bank robberies a year," said Rice. "It's much easier for the investigators to refer to somebody by their serial name rather than the guy that robbed five banks."
The FBI's four field offices covering Sacramento, San Francisco, Los Angeles and San Diego, are working with local law enforcement officials on the investigation.
"The key to remember is that this is an ongoing active investigation, we're seeking the public's assistance with any tips they may have concerning the geezer bandit," said Foxworth.