Do you think that is possible to hire the U.S. Federal Police (FBI) to deal with a private case in which someone was left without $6300 in cryptocurrency? I'm sure they don't even blink at such things, they are only interested in cases worth millions, so the only thing the OP can hope for is that his case it is part of a big scam and that the perpetrators will one day be caught.
Which is WHY I said I highly doubt that it would be worth it (meaning not worth the effort and resources) considering the amount hr lost which is not that huge compared to the bitfinex hack and that the cost would again not be worth it (again the effort and resources needed would make recovery of the stolen bitcoins not worth it).
- Indeed, the only thing that the op can hope for is that the scam was part of a big enough scam that can pique the interest of the authorities. Huge enough meaning bigger amounts than usual unlike the most hacking wallets that existed which the authorities didn't chase down as much as they did on the wallet containing the bitfinex assets.
- I hope that makes it easier for you to understand now.