Does it smell? Do you not have heat? If it's anti-freeze it's the heater core. If it isn't I'd say check to see if your sunroof drain is clogged. Mine was, and still does leak into the trunk, so I decided to take out all the rear trim for me to keep an eye on the issue. When too much water drains to one drain it backs up and sometimes leaks back into the cab. Did you leave your sunroof venting when it rained? This is my experience with interior leaks
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