The unclaimed winning ticket was recently purchased at West Wyalong Newsagency, but as it is unregistered, officials from The Lott have no way of contacting the winner.

Joanne and Len Lynch, the co-owners of the newsagency, were ecstatic to hear one of their customers had secured the cash.

"This is such a big moment for us - it's the biggest win we've had here," Mrs Lynch said.

"Hopefully the winner discovers the exciting news soon. We'll certainly be encouraging all our players to check their tickets."

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The Lott spokesperson Ally Ramsamy urged West Wyalong residents to "scout high and low" for any lottery tickets they have recently purchased.

"The elusive winner is likely going about their Monday with no clue that they've just won a life-enhancing $100,000 prize," she said.

"It could be hiding in your pockets, car, shopping bag - anywhere you might store lottery tickets for safekeeping."

The mystery player will join an exclusive group who have recently won big in the Riverina, including a Griffith grandfather who won $100,000 over Christmas, a Coolamon woman who secured a life-changing $3 million and a Wagga man who began planning his early retirement after winning $2 million.

The winning ticket holder can claim their prize by contacting The Lott on 131 868.

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