@Wolvenworks
Well, if I remember correctly, he never told anyone other than his maid that he was a hero, and now he's not a hero anymore, and no method of force-revealing his previous jobs (not to mention the only way of changing jobs we've been introduced to is that tome, which is unique, and what the church was after) has been mentioned, and even if there was, there would be some doubt as to him actually being a hero formerly, as noone knew of a hero existing at that time.
Sure, his analyze shows current job and skills, but there's no way of knowing if it would show previous jobs.
Though i'm curious as to how they would go about finding a 'hero' to fight the 'demon lord', and whether or not they would mistakenly find the actual demon lord and believe him to be the hero?