Thank goodness the person who sold you both the eggs was honest and conscientious. Good for her! I hate seeing people who've had illness in their flock continuing to sell eggs from that flock, and they really have no idea if it is a disease that passes through the egg or not. The chance that CRD or MG is on the outside of the egg are slim, unless the person who collected them or packed them handled a sick bird and deposited germs on the outside of the shell. However, with serious chicken diseases, often you are instructed to destroy all packing materials by burning them as well as to destroy the eggs themselves, just in case.
Kudos to the honest and concerned seller for informing you!