I'm sure the voucher will be fine. The first time we ever booked AP rates we went to Downtown Disney first and bought our APs, then no one asked to see them. We've had many AP discount stays, including three this summer, and the only time we've ever been asked to see a pass was at Dixie Landings in 2000. This year, I noticed that our confirmations listed that we had a code rate instead of AP b/c there was a specific code for the AP rate. It used to be that the confirmation actually said AP and that a pass was required.