I'd offer to test them, but I confess I'm a total egg snob. I get mine from a farm family I've known all my life. Brown eggs, from happy chickens. They apologize when the yolks are too dark; I keep telling them they should be charging a big fat premium for those. The flavour is just magnificent ... !
IMHO, eating local is one of the best things we can do for the earth and the economy. Sometimes it's a little more expensive but it always seems to taste more yummy! Besides, Farmer Fred down the road is a more likely dource of food if things go seriously south.