I fixed my problem without removal of the glass. I had a leak coming through the(be forgiving as I do not know the proper term...lol) gap that the trunk arm goes between when you put the lid down

The leak was coming through part of the urethane that was damaged/pinched, running down the back glass and in a recessed part of the metal shelf, going into the trunk because it had nowhere else to go. What I did was removed the trim around the backglass and trickled water down the backglass in certain parts while looking through the backglass. When I found the general area it was coming in, I used a little urethane(I said silicone by mistake in my original post) to go along the area I thought the leak was located. I trickled water in the same area, and this time it didn't leak. I put the trim back on around the backglass and reinstalled the shelf carpeting. No more leaky since. If you cannot find the leak, but you have a feeling it is coming through the backglass, go to Safelite(sorry I am partial, my wife works for them

) and have them check it out. Good luck.