All your antifreeze leaked out of car while you were parked for an back further not close to the radiator?

It is unlikely that antifreeze would leak from the car while it is parked unless there is a fault in the cooling system or a significant impact. Antifreeze is a coolant that circulates through the engine and radiator, and it is not typically exposed to the exterior of the vehicle. If you suspect a coolant leak, it is best to consult with a mechanic to identify the source of the leak and have it repaired.