I have used the dollar bill on checking the rubber bumpers. They are right on. Also I have ridden in the cargo area. I cannot find or duplicate the rattle. I’m going to really look at the hatch lock today. It works perfectly. It does sound different than my other X5. I have a red 4.6 and a blue 3.0 stick.

__________________
2003 4.6is X5
2003 525it
2003 E53 X5 Standard shift