Andy Thompson / USA TODAY NETWORK-Wisconsin

Maybe the person who bought the Powerball ticket worth $155.2 million in March is still preparing for the huge financial windfall.

Maybe the ticket-holder, who beat the odds of 1 in 292,201,338 to win the staggering prize, wants to avoid as much fanfare and media attention as possible by waiting it out.

Or, just maybe, the person who owns the ticket either doesn’t realize it's worth a fortune, unwittingly threw it away, or lost it.

Regardless, the winner's identity remains a mystery.

“No one has come forward to claim the prize,” Nicole Anspach of the Wisconsin Department of Revenue told USA TODAY NETWORK-Wisconsin.

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It’s not a panic situation, but the deadline is approaching for the ticket to be redeemed. The winner has until Sept. 18 to claim the jackpot in person at the Wisconsin Lottery’s office in Madison.

By law, winning tickets must be redeemed within 180 days or the money reverts to property tax relief.

The ticket was purchased at a gas station/convenience store in Pewaukee. It's worth $155.2 million when paid out as an annuity, or $93.1 million as a lump-sum cash payment.

There have been lottery jackpots of $1 million that have gone unclaimed in Wisconsin, but nothing approaching $155 million.

There is no national or worldwide list of the largest unclaimed jackpots, but there have been some whoppers. A Powerball ticket worth $77 million that was sold in Georgia in 2011 wasn't redeemed. And, in 2016, the winner of a $63 million lotto ticket sold in California didn't come forward.

In the Wisconsin drawing, there has been speculation that the person who bought the ticket can be identified on the Pewaukee store’s video surveillance.

Anspach, the Wisconsin Lottery official, rejected that theory.

“The lottery does not know who the winner is,” Anspach said in an email to USA TODAY NETWORK-Wisconsin. “It would be irresponsible to assume the identity of the winner based (on) surveillance footage. For security purposes, the lottery does not release images or videos obtained from retailers.”

Andy Thompson: 920-996-7270 or awthompson@postcrescent.com; on Twitter @Thompson_AW