[EliRivers]

Being dirty doesn't magically make eggs last longer; these eggs don't need to be washed because they're not very dirty.

While I can't speak for all European eggs, you can store UK eggs for longer, outside the fridge, because they are likely to be significantly less dirty at the point of collection, the chickens they came from are less likely to be infected with salmonella, and because they are not subjected to a damaging process (washing) that aids the transfer of harmful substances from the outside of the egg to the inside.