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How about this scenario:
You have a little water leaking in at the sunroof seal (if it bothers you, sure the sunroof seal can be replaced). The water get in past the seal, the drain tubes have a little junk in them, through freeze/thaw cycles, the water collects in the junked up tubes and freezes. The water continues to collect in the front area of the sunrrof, then it thaws enough that melt water drips in to the interior. HOW it makes it onto just the carpet does confuse me a little though.
Again, make sure the sunroof drains are all working, front and rear. If they are working freely, you shouldn't get water inside the car from the sunroof, the drain hoses for the roof are pretty large diameter.
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