It would sure help to know what area you are from? what were the conditions outside? Did the car spend time Inside before going outside again. Here, up North, if I wash my car in my garage, all the humidity from the garage gets Inside the car, if I throw it out overnight without leaving a window slightly opened, the car will be frosted outside and Inside the next morning for sure.
Check the spare tire well.. I had water getting in there.
Need to go to the dealer but being without a car as they make a weak attempt to fix it and then tell me there is no problem (even though there is signs of water entry) after 3-4 days is not in the plans