Thomas Edwin Castello, Does He Exist?

I am just wondering if this guy is real. I have been looking into the Dulce base and have found his story (along with Benewits and such) to be quite farfetched. Castello even tells the guy he's talking to the location of were he is.(I believe it to be Porto Rico, Lemone; something along those lines. It's been awhile since i read that book.) If he is runing from the gov't wouldn't you not say that to someone? But he must still be alive ( saying that he is real) because he keeps intouch with those 5 people who have the boxes full of schematics, Documents and what not. because I have not yet to see anyone come out to expose the truth.