When we've used them in the past, we also just picked up our tickets at one of the booths. We could even pick them up the night before we wanted to use them, which was nice. I believe we had to have the credit card we used to make the purchase and a photo ID.
Usually Get Away Today mails you a packet with all your info, but it doesn't have anything we've found we really need. Usually some pins, maybe a little backpack thing, some "Get Away Today" lanyards, etc. Along with your hotel information. So just some freebies that we've always been fine without, and information we already have somewhere else. So if you don't get it, don't stress!