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If you're buying eggs from a stranger though, how ould you KNOW that the eggs weren;t incubated for some time? I sre don't want to crack open an egg and find a dead chick or blood...
I'm sure the stranger would have no motivation to incubate the eggs on their own and then sell them, after all they would want return business.
Or do you mean how would you know a hen did not sit on on the eggs for a while? Which again selling this egg would be bad for business. I don't know where to begin answering this question...
How is a carton of "store bought eggs" not buying from a stranger as compared to seeing the face of the farmer/chicken raiser every time you buy the eggs? Ask the store owner what breed of chickens the eggs come from, what type of housing they are kept in, what food they are given, see how long it takes to get a real answer - but don't hold your breath. Next ask the "stranger" at the farmers market with eggs for sale on their table those same questions.
Now that you have that done, ask those same people if the eggs could have ever been incubated. If the store owner comes back with a fast no, consider his motivations to get you to buy the eggs. Where the farmers market person will probably tell you something more like, nope none of my hens are broody.
If that's not enough for you, hold the egg up to a bright light(flashlight is probably best) and take a gander.
As for the blood, the only reason you never see blood is store bought eggs is because they are old and the blood has just mixed in with the rest of it to the point of being faded out.