Probably bad for eating and anything unless you have a broody and a rooster.
I'd toss them unless you think they are fertile.
It may sound gross but a fertile egg under a broody can be eaten at any stage safely.
Though I'd highly recommend cooking it.
As far as infertile eggs, as long as it doesnt smell... you can try it.
A rotten egg has a very obvious warning signal, but I have no idea about shelf life for infertile eggs.
Here in China, back in Korea, and out in the countryside in Japan they dont refrigerate their eggs, but I have little details on the process and time constraints. I've only been thinking and learning about fertile eggs lately.