I’m glad you got it fixed. My car had 3 rattles when I first got it (2 previous owners). I totally agree that a passenger needs to be present to locate it. I was certain that a noise was coming from inside the dash around the radio. It turned out to be the roof lock. I’ve got another that I’m sure comes from around the dials, but the sound isn’t present with the roof down. I now think it could be from where the roof connects to the top of the windscreen.