The mystery winner has not been registered so lotto officials will have to wait for someone to come forward before confirming the life-changing news.
Newsgent owner Yu Ho said he hopes the winner will return to check tickets with him.
“We are very happy to have sold this winning entry,” he told Lot.
“It’s the biggest division we’ve sold here.
If yes, he is asking every customer who walks to check the Powerball ticket.
The winning numbers were 12, 10, 2, 2 and 2 with all the important powerball numbers 20.