Is there anyway a household AC unit could still be filled with refrigerant if its at the curb? Copper piping is just clean cut, not bent or sealed off and there was a triangular piece of radiator on top of the unit unattached to anything. Is there a way to tell (besides the obvious and illegal breaking of the lines) if a sealed unit is still "sealed"? No one was home, it was garbage night and I really didn't want to just leave it there knowing what I could get out of it.