Second, I'm not sure if my tests will work on my spam samples which have the spam encapsulated with the "report_safe" setting set to a value of "1".I wouldn't expect it to work at all. "report_safe" encapsulation creates a new email which isn't a spam.
From what I read on pyzor's home page and how it works, pyzor strips off all headers. So I would assume it doesn't matter if it's encapsulated. I could be, and quite likely am, totally wrong about this, of course.