wet floorboard

I have a 2013 TRD Sport. Driverside carpet is getting wet when I drive in rain. I was in an accident in the summer and did not notice this until the rain started. I had it at the body shop who did repair and they checked for leaks. Nothing! I know this is coming up from bottom. They put sealer on the grommets but after driving through hard rain, it's wet again. The body shop says no way it's from the accident even though there was almost $13000.000 worth of damage. I am thinking of just pulling carpet back(the body shop did this) and driving that way untiI I can confirm that it's coming up from bottom. There is not moisture around foot pedals or firewall. Any ideas?

 

There's nothing magical about leaks. Just run the truck through a car wash or take a garden hose to suspect areas and check It would be helpful to know exactly what areas were repaired from the accident. Was the windshield removed? Did the plastic cowl cover below the wipers get removed?