Here in Portugal eggs are not kept in the fridge in the supermarket. But I've seen recommendations that eggs should be stored in the fridge, just not on the fridge door since there are bigger temperature variations there. Also, almost every fridge sold here comes with a little support for you to put the eggs on the fridge door (which you shouldn't do). And I've read that eggs should be stored in their original cartoon because it protects them from absorbing smells.