I had water in tail lights after my car was painted; replaced the tail light gaskets and problem was fixed.
It could be the weather rubber strip around trunk that is old, dry and cracked, also the back window, the antenna and spoiler holes and not sure but maybe if you have moonroof sometimes you get the front floor flooded or the trunk because the water that gets inside moonroof that goes thru front and rear fenders may be clogged causing water to get inside car or trunk and you will need a long thin wire to clean the hoses and putting water on the moonroof holes to see if water runs freely.
It could be the weather rubber strip around trunk that is old, dry and cracked, also the back window, the antenna and spoiler holes and not sure but maybe if you have moonroof sometimes you get the front floor flooded or the trunk because the water that gets inside moonroof that goes thru front and rear fenders may be clogged causing water to get inside car or trunk and you will need a long thin wire to clean the hoses and putting water on the moonroof holes to see if water runs freely.
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