I doubt they use recordings for fraud prevention. I'd be pretty upset if my winning lottery ticket were denied because the store lost the recording, or never had them. It's just too costly to record every purchase.
Actually the major source of fraud in most lotteries is the store owner . For small wins the ticket is taken back to the store to scan it to check for a win, the store owner will tell the buyer that it lost, or that it only won a much smaller prize, pay that out of the till and then claim the prize.
Especially in poor/immigrant communities where many player may not speak English or have internet access.
There was a story on here about an analyst for an oil company who worked out the random number sequence for a lottery in Ontario. He also analysed the winning claims and discovered that certain stores where claiming a disproportionate number of middle wins.
