Okay... I have to give myself a /facepalm/ here because this has gone on 6 pages without the obvious being stated (though I might have missed it).
In my professional opinion I'd immediatly suspect the Gamestop employees of being responsible for this, which the article doesn't even hint at here. I'd immediatly guess that the guys in the store know about camera coverage within the mall, and probably that there is no camera aimed at the floor right outside their store by default. Heck, having worked in a monitor room to cover specific locations of "floor space" we had to rotate cameras, and in like our parking garage the cameras only covered intersections (as the likely place for accidents) not the spaces between intersections which means that if you knew this mugging someone in a parking garage would be fairly easy (I've worked security for both Mohegan Sun and Foxwoods, the #3 and #1 biggest casinos in the world respectively).
Plus your right, being able to move 100+ copies of a game seems to be pushing it under any kind of reasonable circumstances. Plus they took some items from behind the counter which are undisclosed. Depending on the Gamestop and the items this might show "insider knowlege".
What I am guessing is that the gamestop employees had a friend come in with knowlege of the security system, making it easy for him to get away unidentified/no clear facial shot and grab the stuff. The claims of a gunman outside work simply because there would be no way of proving whether there was one there or not if the camera coverage is set that way.
IF they knew mall security and how the cameras were set, it could be very easy to avoid being spotted/identified, which again points towards the suspect getting away and not being caught... I mean you would expect some shots of someone lugging 100 copies of a game away to get attention whether at an indoor or outdoor mall. Indoor or outdoor again, any camera coverage is going to have gaps if you know where they are (and outdoor malls might not even have any kind of parking lot cams).
So really, if *I* was the one involved I'd be grilling the Gamestop employees.
Besides which let me be honest, gun threats aren't what you think. If someone pulls a gun and says "do this or I'll shoot" one of your best answers is to go "lol, go for it, you might get me, but right here you'll get eaten alive by forensics so there is no point". More and more people are realizing this.
It's like one of the #1 self defense techniques a person can learn is to never, ever go anywhere with someone pointing a gun at you. See if they bring you someplace they can control the situation the odds of them being caught later go down, and your increasingly at their mercy. At the very least point out the odds of them getitng away with it, and make them shoot you on the spot since then at least they're likely to be caught, as opposed to if they take you away to some nice, relatively public place to do whatever they want to do and make an effort at disposing of the evidence.
I mean honestly, anyone with half a brain at a mall or minimall is going to be relatively hard to intimidate with a gun. Especially a relatively high traffic store like a Gamestop. It's not like a small, isolated story (like a packy, or conveinence store) in the middle of the night.