NEW : Unidentified person who left $ 300k in cab is a famous professional , age 28 . TO : ` ` I did the right thing , that 's it , '' driver tell KLAS . TO : That 's the way our parents taught us when I was a kid , '' cabbie Gerardo Gamboa told CNN affiliate KVVU . ` Gambler was devastated at his absentmindedness , cab firm official says . TO : ` ` They call us sin city . But it 's not . It 's angel city , '' cab firm says .
NEW : Unidentified person who left $ 300k in cab is a famous professional , age 28 . TO : ` ` I did the right thing , that 's it , '' driver tell KLAS . TO : Gambler was devastated at his absentmindedness , cab firm official says . TO : ` ` They call us sin city . But it 's not . It 's angel city , '' cab firm says .