Out of package home button issues.

This past Christmas I received an iPod touch 4th generation white model. When I took it out of the packaging I noticed that the home button was slightly depressed. At first I thought it was the way the iPod came, but after using my friends own ipod I noticed his home button was at regular level. This would not be a problem, except it sometimes makes the home button unresponsive. My question is: would the warranty cover this issue, and if so should I call apple support, or should I take it to an apple store?