The Bitcoin that was confiscated went here
https://www.blockchain.com/explorer/addresses/btc/bc1q9n47jz5lfeagee6jkclq3jtvsdcd7wl27fgk3v Seems it was just some hot wallets by chipmixer and not the private keys of user interactions because then it would have been a lot more txs.
Also some stuff is hard to believe. Like the Hosting was bought by the suspect with his real, actual paypal account? I dont believe it

Not sure why there was Terrabytes of data.Maybe they just want to spread fear & panic. Or maybe there was just some other stuff on the (shared) server and they just took it all. I mean if they really can see any mix ever done on Chipmixer we would probably have seen some big busts already. And if they really had all this data, they surely would not put this in a press release but hide it so they can first take down all the big money launderers who used the service like the big hacks, ransom stuff and darknet marketplaces and whatnot.