Washers/dryers / stoves will bring the same price.Most buyers will require anything with a refigeration compressor to be removed or evacuated.The compressor from the fridge and the electric motors from the washer/dryer will be worth more.But dont try to remove the compressor unless you are a pro.It has a lot of pressure and can be dangerous.As for "hidden copper" there will be only the insulated copper present in the items you described.....other than the copper present in the electric motors and compressor unless they are aluminum wound.