End Button Peeling...

[MILH0U5E]

I searched this thinking it would be a common issue, but only found a thread about the paint on the back rubbing off...

The silver material that covers the bottom buttons of my Hero is beginning to peel on the End button. Anyone else have this with their phones?

It's a minor cosmetic thing right now, but it could turn into something more down the road. Do I wait until it worsens to send back to Sprint, or do I take it back now and have them fix or replace it? If I take it back now, should I take it to a store, or do the return thing online to give me more time to reroot the phone?