i'm pretty sure the only fastpass you needed the 12 digit confirmation number for was BOG lunch and as of 2/25/15 you can no longer make FP+'s for there and you just make an ADR like all other restaurants.
i thought i was going to be getting a FP+ for BOG when i booked my package so i asked for the full 12 digit confirmation number and they told me what it was so if you really want it then just call and ask for it.