Eh, depending on the mixer. For all we know, ChipMixer wasn't keeping logs. What's the point of keeping logs if you are not a honeypot?
~snip~
I'm surprised that you wrote something like this, considering that we established a long time ago that CM kept absolutely everything, from logs to private keys and vouchers, and that everyone who kept their funds on those PKs and vouchers lost their BTC. If my memory serves me well, the official information is that 7 GB of data was seized.