Adriana Alen said she found the money at a Chase Bank ATM in Boynton Beach and turned it in to officials, The Palm Beach Post reported Tuesday.
"It was just laying there. The guy up there was testing me," Alen said. "I just hope the person who left it will find it. That's a lot of money.
"You don't know," she said. "Maybe they need it for groceries or have a sick child. It never crossed my mind to take the money."
Boynton Beach police spokeswoman Stephanie Slater said the money will be turned over to the bank's manager and officials will use cameras and the ATM's transaction information to find the owner of the cash.