The windshield fog was my first clue something was wrong. I had read about people having leaks but thought that I was lucky avoiding the issue. We had a hard rain about three months ago. My early 16 and my wife's late 16 were out in the torrent for two days. It was very sunny the next few days. Hers was worse, but both had fogged up windshields. To note, the windshield was the only window fogged. I went looking for water. In both cars the hatch had about an inch of water. I had to lift the cover and pull the spare to see it, but it was sloshing around back there. I don't know why, but both stared leaking about the same time. They didn't leak the first year of ownership and now they do it most times it rains hard.
Tldr; Foggy windshields don't equal front end leaks. A flooded rear can fog the front glass.
Tldr; Foggy windshields don't equal front end leaks. A flooded rear can fog the front glass.