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Thank you for notifying the bank. As the money was found outside the bank (in public), the proper entity to turn the money over to is the City Police Department. (You can contact them using their non-emergency number).
Here is the California Civil Code on this subject: http://www.leginfo.ca.gov/cgi-bin/displaycode?section=civ&group=02001-03000&file=2080-2080.10