No, I don't think they were. I did originally, and then I read something that said they were from her answering machine in her LA home. (And I wish I could tell you why I believed the answering machine story or where I got it, but I don't remember it now.)
Off topic, but worth a glance..:)
sw
I don't think anyone will see any of the Marshall ESTATE money. I think it died when she died.
So someone pulled out the tape (they still use those, eh?) and saved it for what --- blackmail? Sounds like it to me.