In the case that information I need is trapped on my profile(not in messages, I just need the long versions of profile about text on my profile), is it possible to retriev this informatioin? Also curious about retreaving old SR forum threads, etc.
Are there archives of these or is grep the only way?
You mean online archives? Not that I know of. If you haven't already, you should take a look at Gwern's black-net market archive. Unfortunately, there's not a great way to parse them, but if you already know what you're looking for grep will definitely work :)