We sometimes have a hard time coordinating whose job it is to get eggs. I checked this pm and it looks like they went unchecked three days in a row. When I checked just now, two had hens on them… I’m guessing broody, which is new. N Florida. Past few nights down to 50-60s. Warm during day? I float tested maybe 1/4 and all looked fine? Biggest concern is birds sitting on them and encouraging spoilage.
Float testing is not going to help here.
Every egg has an air cell. The air cell gets bigger over time. After a while, the air cell is so big the egg will float. That can happen sooner with some eggs than others, but generally takes a few weeks.
Eggs that are less than 3 days old are not going to float, because they have not had long enough for the air cells to get big.
Float testing is most likely to be useful if you find a hidden clutch of eggs and you have no idea how many days or weeks old they are. The ones that float are probably old enough that you don't want to eat them.
As regards whether the eggs are safe to eat: almost certainly yes, even with the warm temperatures and the broody hens. I've had infertile eggs that spent a week in an incubator (same temperature as a broody hen), and they seemed fine when I cracked them open. (I was testing whether the eggs were fertile by giving them a chance to develop: no development, so not fertile.)
If you have a rooster, and if a hen was sitting on the egg the whole time, you might find tiny chick embryos when you open some of the eggs. You probably cannot find them by candling at this early stage. But if the hens were off the nests for the night, or if you have no rooster, then you will not find any development in the eggs. Partly-developed eggs are also safe to eat, but people disagree on whether they are gross or a delicacy
If you're worried open them into a bowl before you use them to make sure there's nothing that started to develop in them.
That is a good plan for any questionable eggs, and some people do it for all eggs just to be sure. Eggs from the store will usually not have blood spots or other oddities, because they are candled to check for things like that, but with eggs from a backyard flock you usually won't know about a blood spot until you open the egg. Blood spots are safe to cook & eat too, but are another thing that some people find unappetizing. The blood spot may be visible in some cooked dishes, but not in dark-colored things like brownies or meatloaf
