The winning entry was bought in Darwin for the weekend's Tattslotto draw but the winner doesn't know don't about their rich haul.

The elusive winner holds one of the 12 division one winning entries nationally in TattsLotto draw 4051, drawn Saturday. Each entry took home a division one prize of $410,606.71

Although the entry is registered to a Tatts Card, Tatts officials have been unable to make contact with the winner and deliver the life-changing news because their contact details may be out of date.

Leanyer Newsagency owner Robyn Wright said she was very excited to have sold another division one winning entry.

"I've been telling everyone we've sold a division one winning entry and encouraging all of our customers to check their tickets!" she exclaimed.

"This is the tenth division one winning entry we've sold at this outlet over the past 37 years. The last one was three years ago.

"All of our customers have been very excited for us and of course hoping it is their ticket. We hope we find our winner soon and we hope they are one of our regulars.

"In this current climate it's really nice to celebrate something so wonderful!"

The Lott spokesperson Bronwyn Spencer said the Darwin mystery winner could be oblivious to the fact their winning entry was in their pocket, in their purse or stuck on the fridge.

"There are over 410,000 reasons why you should check your ticket today! Once you discover you are a division one winner, imagine how you could share your windfall with your friends and family!" she said.

"You may not think it's possible you could be the division one winner we're searching for, but if you purchased a registered entry in the weekend's TattsLotto draw that you haven't checked yet, you're in with a chance!

"We're urging all TattsLotto players to check their entries as soon as possible and if you discover you are holding the division one winning ticket to contact Tatts on 131 868 to begin the process of claiming your prize."

Ms Spencer also reminded players of the importance of keeping their Tatts Card details up to date so they could be contacted in the event of a win.

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