DON'T eat any spoiled eggs! How to tell if your eggs are spolied
This is an oldie, but it bears repeating. If you are not sure if you eggs are still good, you simply place them in cold water. If they float they are BAD. The reason is that as the eggs spoil, gasses form (you know that stinky egg smell) and will cause the egg to float. So those sinkers are a great thing. You can use this test on store bought or farm fresh eggs. I had to research this topic because when I first started raising hens, some would lay in inconspicuous places and when I would find the eggs I would not know how old they were. This test was perfect.