Gamboa found the bag after taking the unidentified passenger from the Cosmopolitan casino to the Bellagio. He called his dispatcher and dropped off the money at the taxi's office. Its rightful owner, an unnamed professional poker player, eventually stopped by to claim his winnings.
He also asked to shake Gamboa's hand and promised to send him a reward.
The honest driver said he would never have considered keeping the cash.
"I don't care from $10 to higher. My dignity is not for sale, and that's the way I am. That's the way our parents taught us when I was a kid," he said. "All I wanted to do was just call my dispatcher and return it, and this is the only chance I have to show cab drivers in Las Vegas are not bad people."
Gamboa's good deed earned him Yellow Checker Cab's prize for Driver of the Year, $1,000 and a pricey dinner for two.
Susan Sarandon 'very excited' about daughter's pregnancy
Interpol investigating stolen passports on missing flight