It's a little late for this advice now, but a case would have prevented those. The camera is not quite flush with the back, but pretty close. Setting the phone down on the back or having it slide up against anything abrasive could account for scratches like that. Even being in your pocket can cause that kind of stuff. The lens on my last phone rendered the whole camera useless because of the scratches and that lens never saw anything but the inside of my pocket or open air. Unless you have microfiber lined pockets then you can't really say they aren't scratching your lens. Those don't look like normal pocket scratches though. They almost look like someone tried wiping fingerprints off the lens with something that was too coarse. Maybe a zipper hit it or something like that. Anyway, a case would set the lens a little deeper and away from things that could hurt it. I'm thinking that going forward if you want to prevent more damage then you should look into something like that.
T-Mobile iAKA (iPhone Ass Kicking Android)
(also known as the LG G2)
Hardwired and mounted in my car to be used solely for running the Torque app. Best use for an EVO I've ever found.
I still find uses for this phone even though I switched to another G2 in January '14. That thing was a tank and I loved it!
QUIT STARING AT MY AVATAR!!