I'll admit it might not be the best method, but I also messaged this person when the original post was made saying that I know his first name, last name, face, and location (which is pretty easy to discern if you spend more than 10 seconds looking at his comment history). The list goes further than those four, but those are the four I listed to her. Literally his name and a description of what he looks like could suffice too. Literally anything to verify this.