I have 1000s of reddit and hacker news comments from before 2023, and lots of long form writing too. But as you point out, those are all in the training set, and in pangram's "definitely human" training set too.

The ones that sound like LLMs tend to be the ones that were well researched and spent more time on, not the off the cuff stuff, which is most of what I write. So it would take me a while to find something like that.

But you're welcome to dive into my reddit and HN history, or all my blog posts on the wayback machine if you want to look for one. :)