Visible crew/equipment: The telescopic handle of a boom mic is visible in the reflection of the right window during the questioning of the gay butler in the penthouse. (01:03:05)
Visible crew/equipment: The first time the movie shows Jordan driving out of the Country Club, high on Lemmon, the front of a camera is visible to the right.
Chosen answer: As seen from Donne's reaction when the FBI storm the building shortly after, It should be assumed that Donnie told the FBI himself, and kept the note as evidence. One of the reasons for this could be that Donnie must have felt betrayed or something similar.
Dra9onBorn117