I get that with one instance the FBI wouldn't want to "waste" there time, but it seems like TX and HJbondar are pretty much able to establish a pattern with money totaling well over 10k perhaps the collected information will better pique their interest in pursuing matters.
Worst case scenario, you could try taking it to your local investigative news channel as they seem to enjoy busting scammers since it makes for good TV.
I hope everyone is made whole, however it plays out.