The coins belong to casino, that's for sure because the coins aren't tainted or have problem with regulation, so the casino can claim it.
I faced something similar to binance exchange, but the good news was when they integrated the network after 2months they credited my fund which was excellent.
This require a big luck because even though the CEX gets bigger, they could remove the network or even delist the tokens.
but I don't think the casino will refuse to recover your funds if you request it in the correct way, although it could take a while to do so, so you would have to be very patient.
How the victim supposed to request in "correct way", I would like to know know, it will help other people too.