PHILADELPHIA (CBS) -- If you have any old Powerball tickets sitting around you might want to give them another look.

You could be sitting on a $100,000 prize. But your window to cash in is closing.

The winning ticket was purchased at a Wawa on Dekalb Pike in Center Square on Sept. 20 of last year.

The ticket matched four of the five balls drawn, plus the Powerball.

Lottery officials say a prize claim must be filed with the Pennsylvania Lottery by Sept. 20 of this year.