Water in a boot coming from unexpected place

Hello, hope to find you all well.
I found a pint of pure rain water in the spare wheel well. Perfect, exactly what I was looking for.

After a week of investigation, the water seems to flow from the vertical plane of the junction of two rear metal sheets.

Notice:
the following sheet metal diagram I composed, regards the left side but I found the problem on the rear right part of the boot (in the place where the jack is stored). I apologize, this is what the web offers.

The green arrow indicates the point where I found a rusty, wet line coming from the contact surfaces of two metal sheets:

Assembly.jpg


In your opinion, does the factory assembly pattern go from A to D during the assembly?
Could the water, despite the rear light gasket appears to be watertight, comes in from light, runs in the bottom part of "D" and fluish from the junction "C-D"?
 
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Hallo all,
I've sealed with gummy tape all suspected water access points indicated in the yoeddynz topic.
Today here it's rainy...
Let's wait and see...
Have a good week-end
 
Hello all,
well, since the gummy tape was an experiment, I removed it off and cleaned the gasket's surface. To prevent re-flooding, I tried to pull the gasket, as if I would remove it. Once I pulled it out for 2 or 3 millimiters all around the upper segment, I stopped pulling.
It's about 1 month and half that it rains almost 4 times per week but (fingers crossed ) non water came in.
Since new gaskets are impossible to find, I would try to fill the old gasket with a neoprene rod to give it more volume.
When I will have a bit of time, I'll do that and I'll post some pics.
 
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