Wuddabout:
Works unfinished at the time of the author's death?
Abandoned works?
Lost works? Prompt: Aristotle's work on comedy has been lost. Write a short treatise on comedy, using Aristotle's methods as shown in his Corpus and especially his treatises on Rhetoric and Poetics.
Useless. The work is still lost or abandoned.
Who cares? There probably have been hundreds of such texts by later philosophers and authors. None of these has value as a completion of Aristotle's work. The original's importance is historical, and you can't retrofit history.