To collect logs for an IRC server you need to set up a client that will always be on and connected, otherwise you will only have logs from when you had the program turned on. You can't view logs from before you were doing that, unless someone else shares them with you. IRC servers don't publish their internal logs normally.

Are there people lurking IRC just collecting logs, sure. But that also goes for everything else. If you delete this comment, there are people out there who will still have a copy, it's not that hard. It will likely be on Internet Archive too.