I believe the goal is simply to demonstrate that "the look" is indeed a copy of the iPhone.
Perhaps better than duck tape obscuring logos, just a simple digital image of both phones with any reference to brand, photoshopped out. Keep it simple...and a good image can hit it home.
Except that phones are not being sold without logos. Why not hide dedicated shutter button as well, for example, on phones that have it) to show that rest of the design is really looklike?
Jury should see them exactly the same way ordinary buyers see them.