As reported in the Washington Post

Hunter Shamatt, 20, had just arrived in Las Vegas on a Frontier flight from Omaha, Nebraska, when he noticed his wallet was gone. It contained $460 and his ID card. It was his sister's wedding weekend, so he borrowed money from his parents and tried to worry too much. He called Frontier to report the missing wallet, but it had not been turned in. "It being Vegas and all, I thought it was gone forever," he said.

A few days after he returned home, a package arrived. It contained his wallet, plus this note. Instead of being stolen, his wallet had been returned with extra cash! Proving that what happens in Vegas doesn't always stay in Vegas.