Correct me if I'm wrong. I don't think this document needs to be a comprehensive record of every piece of copyrighted material that Copilot or Codex produce. That's something that will be produced during/for the trial process itself. Right now, this is just establishing the basic premise, and the claims for the type of behavior that is going on.

I think they intentionally picked (literal) textbook examples because they're short and easy for non-experts to grasp and have some understanding of. But I don't think we've seen any of the code from the respective J. Doe's yet, and I would assume we would in the trial (possibly in addition to more cases).