john, we're learning a thing or two together here. the registration card is the one S.C. gives you when you get your tag. It shows the pertinent info about the vehicle and tag # and expiraton dates. If Georgia had a registration card the prevous owner should give it to you.......
you need to talk to someone else at the DMV and ask more questions and explain the senario to the "aupervisor". I have heard of S.C., in some cases, using a Notarized letter for documentation but most "window clerks" probably know little about this.
I know someone "who knows someone" so let me see what I can find out and I'll get back to you.