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My belief is that TESLA has/had a problem sealing the rear glass to trunk lid. Tracked down all the other possibilities and that is the only one left.
The answer to not having water collect in the trunk lid was to replace two little hole covers on the under side of the trunk.
I can tell you this... the number ONE cause of water leaks in a car are the rear taillights sealing to the body. I've seen it literally countless times over the decades.had water coming in to the trunk it was under the carpet but the rugs was dry on top, mosture on the glass more times than not remove the back window moulding, had one of my mechanics in the trunk spray the back window and seams 15-20 mins it was coming from the drivers tailight assems they have a rubber seal around the tailight assem thats not sealing ,the rain water is running down the back glass and running over the tailight assems into the trunk.when i remove the back hatch moulding you could see light coming through where the water was coming in.2013 s 11k miles never hit in the rear, the fix remove both taillight assem 100% silicone around the gaskets