I am late to the discussion here, but I had a hen I thought had never laid an egg in her young life (one year old). I found her stash of 20 eggs hiding outside in the woods and did the float test on all of them. To be clear, the float test indicates freshness, but not necessarily spoilage. All of the eggs sank so I decided to use them. I cracked each into a bowl, did the sniff test and a visual check. Over the course of a week I ate every single one of those eggs and didn't get sick. I wouldn't toss them, or at the very least I'd make them dog food but most of those eggs are probably still good unless you live in a super hot climate.