By Brian Todd
Upper Marlboro, MD (CNN) - We don't know his name or where he lives, but he may have won half of the Powerball jackpot.
It's the usual mid-day buzz at a gas station's convenience store surveillance camera, but then the buzz starts really humming.
A mystery man at an Exxon station in Upper Marlboro, Maryland Thursday checked a Powerball ticket with manager Negassi Ghebre.
"I say 'Yes! That's, you got it!' I say. That's the right number," said Ghebre.
The man may be the Arizona winner of the Powerball drawing, holding a ticket worth nearly $200 million.
Customer Bill Kilby was right next to him.
"I asked him, I said 'Well the winning ticket was from Arizona,' He said 'Well I just got back from there', so, said he was in the military," said Kilby.
The winning ticket was bought at a convenience store near Phoenix.
When he found out back in Maryland, the apparent winner sure made an impression with cashier Kamran Afgan.
"He hit really bad to the counter, really bad, he said Oh my God, really hard," said Afgan.
[Reporter]: "Did it scare you?"
"I'm scared! I think so, have a heart attack," said Afgan.
He says the man ran out, then came back, realizing he'd forgotten to get his gas.
But who is he?
So far, we don't have a name.
On the surveillance tape you can pip up some clues about the guy, and his behavior.
On the video you can see him giving some cash to a young man who doesn't have enough for his purchase. You can see his car pulling out but can't make out his license plate.
A witness says he may have had a Virginia Department of Transportation logo on the back of his vest.
CNN searched for that logo and found a pattern that looks to be similar.
A spokesperson for that agency says it looks like one of their vests, maybe worn by someone in their Safety Service Patrol, but they don't know who the man is.
An Arizona lottery official says no one has come forward yet to redeem the winning ticket.
The person has 180 days to do that, and has to redeem it in Arizona, or mail it in.