This is my old account that I never planned on selling so post quality is very good. I never even joined a signature campaign.

Unfortunately, if I understand correctly your question that is lol, there's no signed message available.

Edit: I just went through some of my post and my first ever post on that account (the one i'm selling) includes my "main" bitcoin address that I use daily and have access to, it think that might be a good confirmation. Matter of fact, escrow will be asked to forward the payment to that same address lol.