The 14 day Apple return policy, how does it work? **URGENT*?

I just got a new iPod touch for a wedding gift and alas, they just came out with new ones. I know there is a 14 day return policy where you can swap out for the newer better one, ive done it before with my macbook pro, but my question is, the item was purchased at Walmart, not at an apple store, so can I still swing this somehow??? Today is day 14 so I need to know ASAP!!! thanks so much!