Roland Barthes has had published a number of works posthumously by way of his archives.

Were they all "finished" in his archive and then put out, or were they pieced together from outlines and notes? What state of preparation were they in?

I've not looked directly at Wittgenstein's note collection before, but it could be an interesting historical example.

Might be worth collecting examples of what has happened to note collections after author's lives. Some obviously have been influential in scholarship, but generally they're subsumed by the broader category of a person's "papers" which are often archived at libraries, museums, and other institutions.

Examples: - Vincentius Placcius' collection used by his students - Niklas Luhmann's zettelkasten which is being heavily studied by Johannes F.K. Schmidt - Mortimer J. Adler - was his kept? where is it stored?

Posthumously published note card collections - Ludwig Wittgenstein - Walter Benjamin's Arcades Project - Ronald Reagan's collection at his presidential library, though it is more of an commonplace book collection of quotes which was later published - Roland Barthes' Mourning Diary - Vladimir Nabokov's The Original of Laura - others...

Just as note collections serve an autobiographical function, perhaps they may also serve as an intellectual autobiographical function? Wittgenstein never managed to complete his 'big book', but in some sense, doesn't his collection of note cards serve this function for those willing to explore it all?

I'd previously suggested that Scott P. Scheper publish not only his book on note taking, but to actually publish his note cards as a stand-alone zettelkasten example to go with them. What if this sort of publishing practice were more commonplace? The modern day equivalent is more likely a person's blog or their wiki. Not enough people are publicly publishing their notes to see what this practice might look like for future generations.