from the title i wasnt thinking we were talking about a trunk...
anywho back on topic... my last car (93 cavalier) my driver's side floor would never dry. even in the middle of a drought in summer it would be bare bones dry, then as soon as i drove it would be soaked, (w/ water) i was thinking about sending it to some desert and selling it due to the fact that it produced water. i never found where it came from, instead i sold it for the alero.
story over.
(as for the trunk issue, i'd with albino, let it dry and see if it gets soaked again...)