In late October, Mega Millions announced that someone had won its $1.5 billion jackpot. But two months have passed and still, no one has come forward to claim the enormous prize, Josh Whiteside, director of marketing at the South Carolina Education Lottery, tells CNBC Make It.

"Everyone's talking about it," said Jee Patel, the manager of the KC Mart in Simpsonville, South Carolina, where the winning ticket was purchased. "It's a mystery."

The winner, who beat the odds of 1 in 302 million, gets 180 days, or until April 21, to collect before the ticket expires.

If the prize goes unclaimed by the deadline, according to the Mega Millions website, "each participating state in the Mega Millions game will get back all the money that state contributed to the unclaimed jackpot."

States set their own priorities on how they spend that unclaimed prize money. "In Maryland and some other states, for example, unclaimed winnings go into pots for player prizes related to second-chance games and promotions and other bonus prizes," reports Slate. "Unclaimed lottery winnings in Wisconsin go to the state's general fund and are used for property tax relief. Georgia reserves some of its for treatment for gambling addiction."

In South Carolina, unclaimed winnings are put in a fund typically used for educational expenses. Throughout the country, states spend a significant portion of lottery proceeds on education.

If the winner is worried about publicity, they might be reassured to learn that South Carolina is one of just eight states that allows lottery winners to do what most financial advisors recommend they should do: remain anonymous. The others are Delaware, Georgia, Kansas, Maryland, North Dakota, Ohio, South Carolina, and Texas.