sounds like someone may have known what to take. I hope you’re right but something sounds off. more info needed
It could have been anyone for all we know about it at this point.
Assuming the motive was in fact robbery (they took 40 guns), someone had to have been there "casing the joint" so they've got him/her/it on video at some point.
Also unless they were just totally naive they would have had a concealed parking lot camera that would have taken their picture coming and going, and their tag number.
Honest cops ought to bust this one before the weekend is done, one would hope.