User blog comment:TDR97/Is it possible/@comment-5448890-20130307013447/@comment-10688548-20130307021450

As we've said, it's the extreme minority of wikis that actually have chat logs, and it's only ones that have taken the effort to manually set it up. I don't think this chat log idea is going to work out. Undeletion with Recuva might be more helpful. Or try reading your browser history (Ctrl-H usually) and trying to find hints there.