[toonblue]

This is a classic Social Engineering technique, that has been employed since the beginning of time. It does work online, however a store would probably have cctv and be able to prove that the item was in the box when you purchased it.

This and also most stores will just have a display unit which you take to the counter for them to grab a freshly sealed unit from their warehouse or locker. Better chance doing it with a company like Amazon or Newegg.