As was previously posted - there is no information stored on a MB. The MB is a portal to your
MDE which has all the information for your account - hotel reservation(room key), park tickets, FPs, and charging privilidiges. If they CM acted like they were consolidating your information then they were just trying to make you feel better.
I have 10 MBs and every single one of them can be used to open my hotel room, get into a park, FPs, and for room charges every time I go.