The expiration date cannot exceed 30 days after the eggs were packed. Egg sizes Eggs come in six sizes. Most recipes are based on large size eggs. Open the box and look at the eggs. The shells should be clean and uncracked but slightly dull.
Shiny shells are a sign of old eggs.
Shake the egg. Fresh eggs make no sound. Old eggs slosh in the shell. Battery eggs are laid by chickens permanently caged. Although not labeled as such, most supermarket eggs are battery raised.