well if the ant was replaced
the person may have thought they needed to remoe the panelling
it is on the passanger side not the drivers side of the trunk ,right?
also the lights are just connected to the car by 5 nuts and the lights' screws
so water can seep in them and not soak the surrounding materiala as there is insualtion seperating it
where looking for the leak you will need to remove all of the trunk trim paneling to see hwere it might be draining 2
don't forget the light as it will be dark in tehtrunk
also make sure the nut for the base of the ant is secure
if it is not then it will let water into the trunk as well
the ant has a hose loook for it and make sure it is connected to go outside of the vehicle not just sitting of to the side