Someone who bought a Powerball ticket from a supermarket in San Leandro woke up Thursday $7 million richer.

The mystery ticket buyer, who had not claimed the prize as of Thursday morning, matched all five numbers drawn but missed the Powerball, said Donna Cordova, a spokeswoman for California State Lottery. The person bought the ticket at the FoodMaxx at 699 Lewelling Blvd. but it remained unclear when.

The individual won $7,054,356 before federal taxes. Often, multiple winners split such large prizes. But in this case the person’s ticket was the only second-place winner. First would require matching the Powerball, too.

Such a prize is uncommon for second place.

“This is substantially higher than our normal,” Cordova said. “We are actually trying to research ourselves to see where it falls.”

The store lucked out, as well — earning a $35,272 retailer bonus, Cordova said, which is not subtracted from the winner’s prize.

Reached by phone, a supermarket manager declined to comment and referred a reporter to the store’s corporate communications department, which did not immediately respond to an inquiry.

Cordova said it may be weeks before the winner’s identity is released because they have to submit a claim form before officials verify the ticket. She reminded winners to claim their prize at the state lottery’s offices in Hayward and Richmond.

“We encourage all players to sign the back of their tickets in ink and keep it in a safe place until they can claim,” she said.

Alejandro Serrano is a San Francisco Chronicle staff writer. Email: alejandro.serrano@sfchronicle.com Twitter: @serrano_alej