brian cassidy was picking up trash outside the store in bangor , maine on thursday when he discovered the wet stack of money beneath a large piece of paper in the parking lot .
he immediately contacted store security to tell them what he had found and realizing it was a sizable sum , they then contacted the police department .
the man , who was later identified as ou chen , said at the time that he had put the money in an envelope in his pocket after leaving work at a nearby restaurant .