I had a massive oil leak due to very different circumstances, but have a similar observation... something we should all be very aware of... the oil level indicator warning light comes very late in the game. The oil pump on this car moves oil EXTREMELY FAST, and so if there is a significant leak, it takes very little time to empty. If you see the light, STOP THE CAR AND TURN OFF THE ENGINE immediately. Not worth losing an engine.
In addition, don't use the oil temperature as a backup indicator if you have an oil level light. When oil is low, the oil temperature sensor will be measuring the air/vacuum where the oil once was and is no longer a valid indicator of oil temp.
Re the OP's situation. I'd suggest getting under the car and taking pictures tonight... also take pictures of the oil in your driveway/garage. If this turns into a dispute, you'll be glad you have maximum documentation. Also if the damage is substantial, mind what you say on the boards, keep your identity to yourself, etc... Nissan reads. That was an issue for me. GOOD LUCK!
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