Another source could be coming in from the tail lights (though I checked those areas) and the moisture and sheer wetness that you see on the underside of the trunk lid could be from that moisture basically trying to evaporate. It goes up and hangs out on the underside of a trunk lid.

However in my case, I'm seeing the water just on the left side, not the right of the trunk. I know that it's not coming in through the antenna either. I replaced that seal a few years ago and it's not leaking.