I'm not so confused about the legality here as much as I don't understand why they need the files at all if they have irrefutable evidence that he has them. If

I'm not so confused about the legality here as much as I don't understand why they need the files at all if they have irrefutable evidence that he has them. If I have sales receipts and camera footage showing you purchased 100 Led Zeppelin CDs, do I need to see the CDs in person before I know you have good taste in music? I'm guessing this has something to do with the subtleties of admissible evidence versus 4th amendment stuff.