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Oh, I don't mean finding copies. I mean finding out which is the original?
Having been recently plagiarized, I have first-hand experience with what is known as "reverse confusion," which is when a well-known "author" steals from a lesser-known one and the assumption is made that the well-known thief was the originator of the information.
This could be a problem in ODP as well. How would an editor ascertain which is the "real" deal? The correct answer is that s/he cannot.
In essence, what editors have to do is allow the copyright battle to be fought and won, and in that case, the thief's site is (presumably) no longer a copy.