Boot leak NOT light seals

I have a slow but annoying water leak in passenger side of my boot. Is seemingly running down seam where rear quarter panel joins body. I can feel moisture up in this seam if I remove wall carpet and put finger up in there? I have siliconed all round rear windscreen so shouldn't be from there? This is also few inches higher higher on the boot wall than the chrome strip fasteners so not them either.



Any ideas?

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