Hey at least the engine still runs hope theres not too much mold. but by seals im assuming you mean the rubber trunk liner? some cars have that rubber gasket on the trunk and even the doors. if it gets knocked out of its groove it wont seal shut when you close the trunk/door. a few years back my cousin used to have a toyota that leaked really bad from the spoiler trunk bolts. we went to home depot bought some of that tan color foamy caulk sealer and sprayed that goop on and it never leaked again haha good luck
I had a leak on my civic's trunk too, and it turned out to be water getting in through a tear in the weatherseal on the back window. Check for cracks or chunks missing from it.