In regard of peeling the shells: old or new, white-shelled or brown, organic or mass produced, stored in the fridge or kept at room temperature, no difference. I've tried tricks like setting the eggs calmly with a spoon into lukewarm or hot water in the cooking pan/pot, piercing tiny holes with a special egg piercing apparatus before boiling, keeping the eggs under running water, in room temp or in a cold place for several minutes after cooking but nothing seems to help. I don't think I overboil eggs (~8-9 min for a set yolk). It's like lottery: sometimes the shells come off easy-peasy, sometimes they don't. I'll try the spoon trick (placing a large spoon carefully inside a cooked egg for peeling) next time I have to peel a dozen or more eggs for a special event.