I received a ticket coming into the FRA airport (watch out for the cameras and the speed limit decreases quickly). Sixt sent me a letter enclosing a copy of the camera ticket anlet me know that I had received one and charged my extra to provide my information to the German Police from the rental contract. I assume at that point they provided the information as stated in the letter, but I have not heard anything since, and it was in August 2015. I have been back to Germany since, rented cars from Sixt, and no further problems. If I ever did get the ticket, I would probably just pay it for the sake of peace of mind.