Damp in trunk.... on 1996 BMW 328i

Heavy rains for 2 days due to Tropical Storm Issac in north Alabama; trunk mat is damp (not soaked); where could water be leaking in? and what suggestions to fix this problem? Thanks so much for your help.

Asked by for the 1996 BMW 328i
1 answer
door seals, window seals, windshield seal among many other areas. water leaks are real tricky to trace.