We almost lost tickets multiple times. It was time consuming. The originals were no expire (as long as we never used them). The replacements expire eventually.
The most recent time, we just happened to catch it because a CM asked to see our AP, and instead of pulling out the plastic card (as I had done every other time), I just happened to open
MDE instead. As it happens MDE showed the ticket first, and I saw "no days left" on a 5-day ticket.
While I was waiting in GS....I saw a 2nd ticket had ALSO been 'used' even though we had AP's, and I had asked to have the AP's prioritized before we used them to enter the park.
The above was not my mistake, and it took 90 minutes in GS. That put a significant wrench in our plans. For all of that, the CM gave us 1 G+pass, and the kind that excludes some attractions. It was rather stressful thinking $1,000+ had just evaporated!
The 'replacement' tickets are now purely in virtual-land. The only way to get them is via GS, but I was told we could call to have them activated.
IF ANYONE HERE already had PARK RESVATIONS BOOKED using a PARK TICKET- you MUST CANCEL THEM if you bought an AP and do not want to lose the ticket.
NOW: The media that you used to BOOK your PARK RESERVATIONS is the NOW the media that gets used when you enter the park, or so I was told.
The other way to protect older tickets is to assign them to a "Place Holder" in the name box, if MDE allows you to re-assign them.