Re: rolling rattle inside a door?
In the old days, there was many a case of UAW workers leaving little presents behind as they sent a new vehicle down the assembly line- cans, bottles, bolts, cans with bolts...you name it. My dad was a GM mechanic in the '50's and when customers came in with their new car they had just bought with a troublesome "mystery noise", he'd find all sorts of things left inside by factory workers. Doors were an easy target and yours sounds like a classic example of what I said.
Maybe somebody dropped a screw or something in your door panel, could have been accidentally, too.
Consuming fossil fuels, one tank at a time.