Okay guys, I have a weird problem that I can't figure out. I bought a fd a while back and started stripping it down. Most of the interior has been pulled out (headliner, all plastic panels, rear bins)

Every time it rains, my driver side rear bin fills with about a cup of water. Ive had a friend hose the car down while I'm inside but can't find where this mystery leak is coming from. Has anyone else ever had this problem? At first I thought it was the sunroof drain hose, but after siliconing the sunroof drain location. Water still comes in. Nothing around it is ever wet when I get in the car... Just seems to fill with water randomly.