The float test does not tell you which egg is good and which is bad. It tells you which egg is fresher. As an egg ages, it loses moisture and the air cell gets bigger. A fresh egg sinks to the bottom. One a little older will stand on end in the bottom of the pan. One still older will float. The float test tells you which ones to be more suspicious of, not which one is good or bad.
Eggs "go bad" by bacteria getting inside and multiplying. If bacteria does not get inside, they don't go bad. A hen can lay eggs for over two weeks, then set on them for three weeks to hatch them. If bacteria gets inside and multiply, they don't hatch. Turkeys can take even longer.
Just because they are older does not necessarily mean they are bad, but they are more suspicious. In a situation like that, I'd feed all of them back to the chcikens, not necessarily because they are bad and, since the hen is not broody, not because I would be worried about them developing. I just don't need them and don't need the hassle. I would not sell them or give them to others, since I did not have control over them for that length of time.
If you want, you can do the float test for your peace of mind. It does tell you age and which are more suspicious. You can use any of them, but I would sniff them before I cracked them. The egg shell is porous. If they are going bad, you have a pretty good chance to tell that by smelling them. And I would crack them in a separate bowl before I mixed them with anything I did not want to throw away.
