I’m still hunting for one rattle somewhere in the back of the car. Sound like plastic piece is touching a panel or glass. Removed all the trunk panels, sealed the clips, removed left part of the trunk soft padding, sealed plastic there… And still it’s there on some of the bumps. People who sit on rear seats say it somewhere in the trunk.
PS I did all the same “improvements”, found a bolt that was not tightened from the factory..