I am having a problem with water leaking into the trunk of my '02 IS300. After a rain I find water on the trunk's floor mat, and pooled inside the black plastic covers on the trunk lid hinges. (when I open the lid the water runs out onto the trunk floor) When I first discovered the problem I found water pooled in the wells at the far right and left of the trunk below the pressure vents. I drained this water, which has not returned, but still a small amount of water is getting in from somewhere. I cannot feel any moisture on any of the upper surfaces that would suggest a source. I'm mystified, and it's driving me nuts. Does anyone have a suggestion?