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 Wikipedia article about the Vatican Library, section on the "Secret Vatican Archives" says that what was supposed to be the largest collection of pre 8th century heretical texts have been misplaced.  I hate shooting from the grassy gnoll, but that sounds a little funny to me.  I suspect the vatican has had at one time copies of everything they found heretical, it for no other reason than to be able to trace heresy.  The allegation should be qualified better in the text of the article, but I don't think it is drivel