"Each participating Mega Millions will get any money back if the jackpot prize is not claimed within the time limit."
Illinois requires Mega Millions winners to report within one year of the drawing date in order to claim their prize.
Speedway Gas Station in Illinois sold winning tickets to the 13, 36, 45, 57 and 67 plus Mega Ball 14 on July 29.
Cash Jackpot - $780.5 million. The gas station that sold the prize also received a $500,000 bonus.