I can tell you I don't remember anything very explicit being ever posted, and afaik Ianthe had something akin to our rules 1 and 5 (on erotica and on explicitness). However, there very much were admissions of illegal activity. I don't think you'd necessarily have to edit them out, because you have no way to know who the authors of them were, for starters; but you'd probably be well advised to put a disclaimer both in the gateway to the mirror, and desirably also when you click on one issue that does have admissions of illegal activity.

However, yes, you'd have to go through all of it, and it's very long.