I cant answer that.
Uploaded images have the same url as the post they are in.
Log shows you uploaded it and made the post.
Only other (unlikely) possibility is that someone else has your password and posted in your name.

Strange that it was Wild Wild West related, it was obviously supposed to be posted in that thread, yet no one else has admitted to it being their scan and the scan doesnt show up elsewhere.

One thing I dont know about (although I dont see how it could affect things) is what happens to your cookie if you are 'mid-session' and then your aol IP address changes (as it does from time to time) - or more to the point, if there are two aol users trying to post at the same time and it happens to both in the same split second. May just be a freak occurrence we cant do anything about.