Which window? Front, rear, side, all? Where you are seeing the fog has different possibilities. Like if it's the windshield it could be a weepy heater core about to go. Also look under the seats, from what I have read in the past Boxsters like to puddle up as there is like a little well under the seats. Drive side is the worst because there is a module that when wet can cause all sorts of issues with power windows, anti theft, etc. It is easy to remove and check if you are are curious.
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