You guys know that Kmeaw isn't the only means to have "Install Package Files" visible on the XMB, it can be either a Dev Kit or a Debug PS3, don't just assume it's CFW.
The following 2 users say thank you to -Skyline for this useful post:
Wow... Have none of you ever heard of DEMONSTRATION MODE? That's how stores install demo apps. It's just disabled on default view. They aren't running a jailbroken PS3, nor one on CFW. It's the exact same PS3 that your local Best Buy has.