Honestly, I never refrigerate my eggs. Unless they're washed or cracked they don't rot, even in hot weather. Now, they DO evaporate, and I have boiled 2 month old eggs and had only a half an egg left in the shell when it was all said and done. It makes sense if you think about it, chickens always lay eggs and if the ones that don't get set just rotted there would be a lot of rotting eggs running around. And have you ever noticed that if a chicken sees egg yolk they slurp it up in an instant? Maybe a defense mechanism, cause a spoiled egg in a nest is a sure way to attract attention from chicken eating things. I dunno, that's my speculation on the matter.
Also, if you're unsure if an egg is rotten or not, just sniff the shell. You'll know if it's bad!