Water in Trunk-Cannot Find Leak
 

I get water in the trunk spare tire well. Everything else is absolutely dry, no wetness on the cover over the spare tire or anywhere else inside the trunk. Where is the water coming from?
1. I have sprayed water around the taillights, trunk lid opening and cannot see any water penetration.
2. A long rain storm or after a snow storm is when I find water in the trunk.
3. Sunroof is draining (check the two front drains). Are there rear drains in the sunroof, and if so where do they dump to?

Other than just replacing the trunk weatherstrip, what else should I be looking for?

if a taillight gasket is bad, it can leak water inside the trunk.