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Many of the affidavits are redundant. This is actually very helpful because, in my experience, what is and isn't redacted seems to be a random process. Even within the same document, information will be redacted in one place but not in another. Comparing different documents allows us to use one to fill in holes of the others.
ps
In the document 7-529-M-01, text is visible underneath the redactions. My eyes will need some help making out some of the text though.
pps comedy
Camus' the Plague was seized in search.
MSN was confused by the FBI using [at] instead of "@" and [dot] instead of '.'
The FBI + MS == Hilarity