The mystery entrant was one of 10 division one winning entries in Saturday's Lotto draw 4397
Lotto officials have no way to contact the new millionaire, who holds an unregistered winning entry and "must wait for them to come forward to claim their prize".
The division one winning entry was purchased at Penney's Paper Shop in the suburb of Gungahlin.
"We will be eagerly waiting for the mystery winner to come into our outlet and check their Saturday Lotto ticket," business owner James Penney said.
"We hope we're able to share the winning news with them soon."
The Lott spokesperson Anna Hobdell said the latest winner is likely going about their Monday as normal with no idea they've won $1 million.
"Make sure you check your ticket, which could be in your wallet, handbag, fridge door or car glovebox because the winner could be you and you could be planning what to do with your prize too," Hobdell said.
"If you discover you are holding the winning ticket, contact The Lott on 131 868 to begin the process of claiming your prize."
Saturday night's winning numbers were were 11, 9, 14, 29, 7 and 15, while the supplementary numbers were 17 and 23.
Across Australia, there were 10 division one winning entries in the Saturday Lotto including four in New South Wales, three in Victoria, two in Queensland and one in the Australian Capital Territory.
There are many different ways to get help and information about gambling. Call the National Gambling Helpline on 1800 858 858; use online counselling; find information about help services in your state or territory; get information and support for family and friends; get information about how to talk with someone about their gambling; or contact Gamblers Anonymous. All services are free, confidential and available 24 hours a day, 7 days a week.
