I never send in those product registration cards, but it wouldn't have made much difference anyway. Sweetwater and my local music store were both able to supply serial numbers for the major items, including the amplifiers I spotted in Guitar Center.
I will, however, be diligent in the future about saving receipts, taking photos, and storing that information in a safe place.
The one exception: I was unable to find a receipt for my ADAM monitors and the retailer (Pacific Pro Audio) is no longer in business. Consequently, I have no serial numbers for them.
Now, there were a pair of P-11As in the store that they'd acquired about the same time as the Roland amps. But whereas mine had been pristine, these were really banged up, like they'd been rolling around in the trunk of a car.
Odd for expensive studio monitors to be in such distressed condition, no? Even if those
are mine, I don't want them back.
As for harassing GC, I'm holding off on that until I see the need. I will file a report with their local PD tomorrow. If for some reason GC hasn't reported it, then I'd hope the PD would begin my harassment campaign for me. And should that happen, you bet I'll be all over them. But I'll give them the benefit of doubt for now.