Just wondering. We have just sold our first extra eggs. Three dozen went in 2 minutes at $2.00/doz. at the wifes work. One person asked "how long they will keep" or to the point "what is the expiration date". I prefer to think of it as a "Best if used by..." But I really had no good anwer. I refridgerate the eggs as soon as I collect them so How long would they be good for? I have been marking the carton with the date I finished filling the carton. What do some of you do?