There was a really great Mother Earth News study of various ways of "preserving" eggs from a few (quite a few) years ago, looking at which was the most effective storage/treatment method in terms of maintaining the taste/look/texture of a fresh egg. You could probably google it, I don't have the link. To sum up the findings, "farm" eggs, from healthy free range hens, collected daily and refrigerated, would be virtually unchanged in terms of taste, etc., for 4-5 MONTHS. They should NOT be washed, that removes the "bloom" that provides a barrier against bacteria. Refrigeration isn't strictly necessary if you are going to use them quickly and don't wash them, but it clearly improves the "shelf life".