I have traded/sold a lot of gear at GC.
They finger-print and require ID for all sales/trades (even if you've shopped there for 10+ years and they know you extremely well).
Not only will you get your gear back... but there's also a trail to the thieves.
Even if they had someone else do the transaction, the police (if they do their job) can get this resolved.
On a loosely related note:
Why is credit-card fraud is so rampant?
Because no one goes after the perpetrators!
The CC companies aren't out any money... so they don't care.
A charge-back is issued to the retailer... and they take the loss.
Police don't do anything as it isn't a life/death situation... so it's up to the retailer or victim to pursue it in court.
Most individuals don't have the money to retain a lawyer and go after the perpetrators.
It all gets brushed under the rug... and the cycle continues.
We got burned for a large purchase years ago... and it was a painful learning experience.
I hope you get your gear... and the justice you deserve.