I looked at my car again today and below are the pics.

The drain hole of the sunroof is sealed (?? or clogged) as in the picture.

Also there is a gap between the plastic shield and the taillight assembly on the body side.

Any insight as to how water enter the oddment tray next to the fuse boards and underneath the boot?

Thanks

Further test as suggested, I can safely confirm water drips through the roof drainage behind the D pillars onto the oddment tray and the interior fabric. Probably time to clean it up using the galvanized wire or air compressor gun

Careful with wire, you don't want to damage the tubing

Many have used plastic weed whacker line.

GL