If you had to reschedule for Disney World vacation due to Hurricane Irma, you are likely eligible for what Disney is calling Multiple Experience FastPasses.
These FastPasses will show up in your MyDisneyExperience app and will allow you to make up for any FastPass that you had scheduled for your original vacation itinerary. These FastPasses have no time boundaries, and you may use them at any point during your vacation. They will also work in any park and any FP+ enabled attraction.
If you enter your MyDisneyExperience account to make new FP+ selections, your gifted FastPasses will disappear. If this happens, call technical support. If you have any questions about these FastPasses or think you should get them but can’t find them, give Disney’s Customer Service a call.