[hobs]

Civil courts work by you proving damages (at least in the USA), not by you going on fishing expeditions because they "might" have done something.

So good luck finding the thing that looks exactly like your copyrighted work that's not in the corpus, if you can yeah, you might be able to prove it.

At the end of the day its like a lot of business, where a liability shell game is played out, and if the chain of evidence cant be drawn quite brightly then lawsuits would be frivolous at best.