The camera leaves the apartment about once per week. I do a lot of travel photography.
Still, I don't see how my use could be so damaging so quickly. I've sat and tried to think of the way I hold it, store it, and environments I use it. Nothing rings a bell as to what could be causing it. Even more bizarre, as you guys have noticed, is it's only affecting the bottom of the camera. Everywhere else the camera is flawless, even the plastic surrounding the damaged metal.
While not in use, the camera is stored in a Naneu Pro camera bag with a soft-sleeve insert along with my other accessories and lenses. Speaking of, none of my lenses show this wear either.
I've notified Canon CPS tonight. I'll keep you all updated when they get back to me.