My "is it new?" test works this way: how would I explain what's new to my father (who is 74 years old and knows not much about tech). A7, M7, iOS 7, better camera and flash: not much to say. Touch ID OK that's new, but that's not much.
It's not about your fingerprint though. It's just that cheap scanners are easy to trick and you leave fingerprints everywhere, including on the very surface you scan it on.
Scanners like the one used only work with live fingers, and read geometry deeper than the surface. You're not going to trigger it with an ordinary collected fingerprint.