Well, one would have to think so if we're going to accept "over 100". However, I've seen nothing stating extra AW mags were discovered. Or that extra handgun clips were found. Therefore, the math isn't there. However, buckshot from a shotgun would produce a lot of wounds. Something doesn't add up.
Anyway, American Live Wire is the "news" agency that reported the AW was not used. I know nothing about them but I'm assuming they're a righty org in bed with the NRA in some way.