This is an interesting thought I had recently too.
The hacked funds were taking in cryptocurrencies but a lot of the payouts and buybacks were done in fiat. Since it was in 2016 it started and took a few years for people to be paid back, bitfinex might have to refund people their crypto but they might find a reason not to...
Calculating about the bitcoins spent will be hard for our minds and only government and FBI can find a way for it but there is still around 80% funds in the wallets of hackers which is recovered. If bitfinex not already paid to the victims then they might not find a reason for 'not to...'