This is what I would suspect:
The most recent twists, however, are much more sophisticated. Here's how perhaps the most 'creative' one works:
You receive a letter that you won $50,000 in the Australian lottery. If you call, you're told you will receive a check to cover the taxes and/or fees, as well as additional instructions on how to collect your prize.
You then receive an overnight package that includes a check that looks real, in this example, for $2,650.
The check is supposedly issued in line with a federal law declaring that lottery winners must pay taxes and a processing fee on their winnings.
Prize officials include a letter with the check stating that winners can use these funds to make that payment, and then their 'windfall' check will follow in the mail.
The checks look very real, even to bankers who have seen them.
You're supposed to deposit the check and then write a check to cover the costs/taxes from your account.
Naturally, their check is bogus -- while yours is, in fact, real. And that's how you get scammed.
The fact that you are getting a 'real' check from a lottery foundation makes the Foundation seem quite credible. So if they ask you to pay more fees, or provide more information, it may be harder to refuse.
but, if that's not the case, and this turns out to be legit, then congratulations!