The first winner was Alex Doxie, who grabbed the white envelope filled with $135, that was attached to a fire hydrant near the SAP Center in downtown San Jose.
"We parked right there and the tweet came out – and it said a fire hydrant," said an out of breath Doxie. "So I figured that one, this one, then I looked over here and there it was. So I sprinted from here to there and back. This is good!"
Doxie said he plans on using the money to take his wife out to dinner and to gas up his vehicle.
The mystery cash dropper posted his first tweet in San Jose at about 8:45 a.m. Wednesday morning.
First ever San Jose drop: across from where these sea creatures play, a dog pees in the fall. pic.twitter.com/O3IrpfmPbp
— Hidden Cash (@HiddenCash) May 28, 2014
The person, who has been posting under Hidden Cash (@HiddenCash) on Twitter, has been leaving clues about the whereabouts of his "drops." On late Tuesday, a tweet read "San Jose drops in the morning. Showing the South Bay some love and cash."
A second San Jose cash drop was planted across from downtown's Greyhound Bus station and was found by a local music radio station employee.
The person describes it as "an anonymous social experiment for good" and said the plan is to take it nationwide.
Envelopes have been left at locations across the Bay Area, filled with $20 and $100 bills. In less than a week, more than 130,000 people have started following the account, hoping to cash in.
On Wednesday morning, there was a tweet of "a big announcement coming soon, now that we have reached 100,000 followers."
The mystery cash dropper granted KCBS an interview over the phone and said he would stop the game if any violence related to his cash drops were to occur.
"Hopefully it doesn't come to that and if it does I would immediately stop hiding money in this way. I think most people in the Bay Area are kind of easy going. Most people I see are just having fun with it," he said.
Hidden Cash plans to take his game to Los Angeles this weekend.
Mystery Cash Dropper Takes 'Hidden Cash' To San Jose
for more features.