I found the note, transcribed below, stuck in a yellowing copy of Jacques the Fatalist, borrowed from the Stavros Niarchos Foundation Library a few months ago. I submitted it to the online magazine you’re now reading because it seems to be what the author would have wanted—to make sure the contents continue on.
The note wasn’t dated or signed, but it looked fairly old (semi-brown, stained in parts, and wrinkly, but not falling apart).