They say the victim, who has asked not to be identified by police, purchased a $30 scratch-off ticket at a Lucky Grocery Store on 20 December "with hopes of winning a little extra cash for the holidays".
"He still wasn't sure so he went back to the same grocery store to have the staff confirm it and they said, 'yes, you're a victor, ' " Polen recounted. He immediately became suspicious of his roommates and reported a theft to the police department.
When they went to the grocery store where the ticket was purchased to obtain the surveillance footage to ensure that Saosongyang purchased the ticket, they were informed that it had been stolen, ABC News reported.
The day after that, Saosongyang was caught trying to cash in the real ticket - only to be told by a cashier that it was worth 10,000 times more than its rightful owner believed.
While the investigation revealed that the ticked handed in by Saosongyang was indeed real, it also established that his room-mate was the real victor, the Washington Post writes.
Yet his glee quickly turned sour after he went to the Lottery's District Office in Sacramento to collect his prize.
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The next morning he went to the Lottery's District Office in Sacramento to collect his winnings, but was told his ticket was not only, not a victor, but had been altered. He had purchased a similar scratch card, and then swapped it out for the winning ticket while his unsuspecting roommate was sleeping. In fact, the ticket had been altered.
"I don't know how he did it", Polen said.
Adul Saosongyang is seen in an image provided by the Vacaville Police Department.
The man misunderstood the extent of his prize, thinking he had won "just" $US10,000 ($14,000). But instead of walking out with fistfuls of money, he left with his hands clasped behind his back.
He was booked at the Sacramento County Jail and will be transferred to the Solano County Jail later this week, authorities said. "I saw I won $10,000 in this game, ' and he kind of told us some stuff", said Russ Lopez of California Lottery.
Meanwhile, Polen, the police spokesman, said lottery officials were discussing the winnings with the victim.