You mentioned seeing condensation in the trunk when you checked your oil level (when engine is warm). Do you still see any condensation above the coolant and oil fill caps?
I had this happen on my 2000S...I'd loose just a bit of coolant over the course of a week or so. Coolant tank just two years old and cap ending in .04. I finally took a look at the O-rings in the pressure relief valve and found the larger O-ring to be pinched in one spot. I found a replacement O-ring at a local hardware store, installed it and haven't had a problem (or condensation) since.
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