After washing my car today, right after opening the sunroof while standing outside the door, I noticed a screw sitting in the back-middle of the driver seat. I checked around and the only other screws it matched were the four on the sunroof rails, which were all there. Could it have come from somewhere else? It's certainly possible that it was dropped at service about 3 weeks ago when they were fixing an issue with the sunroof and fell into my seat when I opened the sunroof this time. I didn't notice anything behaving unusual. I just want to be sure my car isn't missing this screw before I toss it.