Are you absolutely sure it's in the roof?
I recently had a rattle that was driving my nuts, but it was one of the caps on top of the strut bar behind the seats. I sounded like it was the cargo cover so I kept taking the cover out and trying to adjust it, then I drove without the cover and found that it wasn't it at all.
I bore you with the story because that one little piece was making a major noise in the back.
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