I think some of the cp spam ended up in one of the archives. There are fed bots that go out and scan the internet for cp and send notices to the host. SauceNAO had to deal with one that actually uploaded cp then reported him to the host for it. It's strange though because 34chan.net had been on there since 2007 and their archives had a lot of cp in it. I got it excluded, there was no historical value in it anyways.
Best to stick to archive.today for chan archives, at lest they don't nuke an entire domain just because one snapshot had illegal content in it.