How frustrated you must be!
A similar thing happened to me years ago when Frank Oz was visiting a movie theater that my brother-in-law worked as the MANAGER! I think he was promoting one of his movies from the early 90s. Same sort of thing--- He told me about it weeks later in question form. "Hey, do you know that I met Frank Oz?" I coulda throttled him for not letting me know that I could have met him, too!
I see you live in New Jersey (and so does Bob!). Anyway, I think Bob makes a yearly showing in the summertime at Sesame Place in PA. So depending on how far you live from there, you might want to think about going to their site and seeing when and if he's going to show up. I think they update it every month or so. If you really want to meet him, I know he does a meet and greet when he's there. It would definitely be worth the admission price!