The scroll can only be accepted once from what I saw. As it stands right now, the one I used expired early yesterday morning, however, my slave account that I rezzed still has the rewards available for the transfer and insta-80. I don't know how long those will last or if I will get the mount if I add a subscription later. Someone else might have better information. I wasn't really concerned about the benefits, I just wanted a tailor along so I could get cloth faster