I would say the eggs are probably ok, but if you do use them, break them open in a dish first to check them. I have eaten older eggs and they were fine and I am fine, no ill effects.
How can you check for bacterial contamination by visual examination?
If the eggs did freeze they would crack. Most likely since they were under your shed they might not have frozen.
Under the shed is out of the sun and likely colder.
I have a friend who lives in Alaska. Especially during the winter months when she gets home from work and collects the eggs they are frozen because she does not heat her coop but her coop is insulated, she put the eggs in her freezer. I have done it too and the eggs are fine and don't take long to thaw out.
I think this is generally fine because the eggs were frozen outside and stayed that way. When an egg is exposed to multiple freeze/thaw cycles all bets are off. IMO, it is too risky to eat them. I'd simply chalk it off as a loss and move on.