I found the source of the leak. If you pull up the trunk weatherstrip along the bottom, it goes over two pieces of sheet metal. These two pieces had a small air gap, water was running into the weather strip along the vertical sides and then going between the sheet metal gap and into the trunk. I pulled the weather strip up to the top where it goes flat (water wont run into this part), cleaned the metal with brake clean and wire brushes then applied 3M super weatherstrip adhesive generously along the ridge of the sheet metal. This both sealed the air gap and prevents water from running into the weatherstrip along the vertical section.