If his manuscripts were labeled "not fit to be published" then why are the Univ. of Sussex and Indiana Univ. going out of their way to publish Newton's work in Alchemy. Wouldn't this be against his wishes.
To me it's unclear whether it's saying they were found labeled that way, or someone upon his death decided as such. I think the latter is more likely, but I'm not sure how common it was for people of the period, or more importantly Newton himself, to label papers as such.