OZ Lotto spokesperson Belinda McDougal said the winning ticket was purchased in Greater Western Sydney, but it was not registered to a NSW Lotteries Players Club card so the lottery has no idea who the winner might be.
"The winner may have woken up this morning and headed off to work oblivious to the fact that they’re now $30 million richer!" McDougal said.
Oz Lotto drawings take place on Tuesdays and ticket sales stop at 19:30 (AEDT). To win the Division 1 prize players must match all 7 of the numbers drawn.