Harry figured out they were getting close by the fact the compass needle was moving as he walked. "You know, we should have gotten a picture off of someone." The description should do, as should looking like they didn't belong. Though you never know; he might find the one blond kid in this town who was into steampunk or something like that.
A good thing appearing like a weirdo in public had stopped bothering him. He entered the restaurant, checked the compass one last time, then picked out the person who matched the description and headed over. "Hey, can I have a word?"