... and hoping to see other 280SLs that are as original as possible.
What are you trying to see on these unrestored cars? Even if a museum has what you're looking for, they may not allow you to get really close to the car.
Ask here for help. Start a thread with an appropriate title, maybe like "Unrestored, Original 280SLs in/near North Carolina", say what you're trying to accomplish, and see what happens. Maybe by the time you get back from Germany, you will have a few members/cars to visit! Good luck.