FYI (sound like FBI), Secret Undercover Agent Yid, (like as if you didn’t know) a S/N is and equals “Screen Name”. Like mine, for instance, deep down I’m a froggie, a little one, so I chose that as my screen name here. You chose “secretagentyid”, obviously that’s your profession.
I’d go out on a limb (Froggies do that all the time) and say you were hired by the wonderful staff as YW headquarters to analyze, probe, do investigation as to who is the elusive “J”. It’s a case that has stumped even the most seasoned detectives and investigators (secretagentyids and secretagentnonyids) at the top most level of the Federal offices, for many a year.
So that’s how you came on the scene. Sorry, with all your detective knowledge notwithstanding, this history many have been kept from you, so you shouldn’t know how hard and complex the case is.
And your modus operandi is (as taught in Elementary detective school, course 3.2), is to pose a question, seemingly innocently indifferent, and analyze the answers. WHEW!!! COVER BLOWN!!