I'm surprised the owner isn't offering a bigger reward himself or matching that reward.   I've been there many times and wouldn't have had a clue where the break room was and it always looks like a fortress with metal gates over the windows.  I'd wonder where these KIDS got that info from.    Did the place light up with Strobes and loud sirens the moment the door was busted open? 
That's an extremely bold robbery.  They were only a few seconds away from being on I-5 and gone. That said I bet it's locals.