Try adding the ticket to your My Disney Experience and reserve Fast Passes. You will only be allowed to reserve Fast Passes for the number of days left on the ticket. And then cancel the reservations. We have days left on non-expiring tickets and when I look at the tickets on my computer, it does not indicate the number of days left. However when I look in the app on my phone, underneath the ticket description it tells me how many days are left. I mentioned this to a Guest Relations employee when I was getting some old tickets changed to current ticket stock and she said the days left on the app aren't displayed accurately all the time.