Still depends on the cops doing their job. Because the store is in an adjacent city, the local PD can't just go there and investigate. I asked if there was any way I could get a name of who sold the amps, they basically said "no". That would be up to the detective, assuming one has been assigned. All the cop would commit to was that he'd update the file.
I have one other possible avenue of investigation. I know someone who used to work in that store, and who still knows a current employee.
I suppose I could start an online bad-mouthing campaign against Guitar Center, but that's already been done many, many times. And they're still pushing $80 Monster cables with every $100 microphone.