Mystery lottery winner hasn't claimed $25m jackpot yet

The winner of the $25 million Oz Lotto jackpot remains a mystery, NSW Lotteries say.

The winning ticket was sold at a 7-Eleven store on Wentworth Avenue in Pendle Hill before the draw on Tuesday night, NSW Lotteries spokeswoman Una O'Neill said in a statement.

"We are hoping that releasing the selling location ... will encourage the winner to check their entry and come forward to claim their prize," she said.

The store's franchises owners, Tony and Sue Singh, told NSW Lotteries they were excited about the win.

The $70 million jackpot, which grew to $74.8 million, was shared between three tickets. One was bought in western Sydney, while the other two were bought in Adelaide and south-west Melbourne.

The South Australian winner, a mother from western Adelaide, told SA Lotteries that she hadn't "had a wink of sleep, nor let the ticket out of my sight" since she checked her $20 ticket.

"I was in bed when I checked my ticket. When I saw that I had won, I must have screamed because the whole family rushed into my bedroom," she said.

The mother, who asked to remain anonymous, said she planned to continue working.

"For now, I just want to celebrate my good luck with my family," she said.

"After coming to terms with my new financial situation, I'll likely put together a 'wish list' for purchases like my dream car and dream holiday, but all that can come later."

The holder of the winning Victorian ticket, which was bought from Murphy's Newsagency on Pakington Street in Geelong West, has yet to come forward.

The previous highest jackpot winner in NSW was a healthcare professional from northern Sydney, who pocketed $38.1 million in November.

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