Officials found a day planner in the Bank of America parking lot after a heist Friday in San Luis Obispo.
They think the suspect dropped it while fleeing the scene.
Surveillance cameras took pictures of him during this latest robbery.
A witness saw a white 5-series BMS speeding away from the bank.
The FBI says someone saw a similar car leave the scene of another robbery believed to be done by the geezer.
The bandit may be wearing a mask or makeup.
He's considered armed and dangerous.