The source of the rattle appears to be the baffle in the little speakers above the dash on both sides. Tap on it and you can hear it rattle. While driving, push on it when rattling. It stops rattling.
I’m out of town with the family in our van, so I have no way to currently test at the moment, but i do remember that it does sound like it comes from around that area on the passenger side (I always just assumed it was coming from inside the dashboard). I will test when I get home at the end of the week. If you are right I thank you 1,000 times for pin pointing it
