They used regular glass to protect something on consignment?  Not safety glass or shatter proof glass but just regular glass?  Yeah, That's not too bright.  

I guess it never occurred to the store manager to put the guns in a safe place at night before closing?  Gun safe perhaps! 

Maybe I just don't know what the normal protocol for protecting weapons in a store is, but an antique on consignment shouldn't have been sitting in an easy to break glass case. 

Possibly an inside job, everyone will assume that they knew where they were going so ATF will be all over your store cameras over the past 24hrs before the heist.  Any reasonable person would doubt that they pulled this job without casing it first.  Any cameras that can capture the plates will be all over this. 

The weapons are gone though. They might recover 1 or 2 but even if they catch the thieves those guns are gone and sold on the street as we speak.  Freaking sad.