Watchmen (partially found original script for DC superhero comic; 1986)
From The Lost Media Wiki
Alan Moore's Watchmen is a 1986 comic maxiseries published by DC Comics. The comic was commercially successful and is one of the most critically acclaimed comics of the 1980's. However, despite Watchmen's popularity throughout the succeeding decades, the original script for the comic has never been publicly available.
Found portions
However despite the entire thing being unavailable to the general population, portions of the script (which is said to be 1032 pages long)[1] has been partially put onto the internet by Twitter users Nick Arvin and Ganzeer.[2] various PDF files containing the first 5 pages have also been found.[3]