Sometimes you can see more in the dark with a flashlight.
Check the hood hinge "pocket" - there is a drain there (check both sides, of course).
Could be sunroof drain lines as well - I had one rust through at the corner where the tubing starts to enter the pillar.

Might be an idea to have someone pour water on various sections of the car, and have someone inside look for it. Pull out your carpeting first, and start from the bottom of the car and work your way up.

Good luck!

__________________
It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D