You may be closer than you think. Baluchistan is home to Ramzi Youeseff and his uncle Bin Al Sheeb. There is good reason to think this is the logical place for Al Queda to hide. We can not go near that border with Iran even if we knew Bin Ladden was there it would set off WW3.
I heard a theory that Bin Laden was under the thumb of the Iranian mullahs which is why we didn't hear from him for so long and why his toned had changed so much when we did.
If they do have him, I would think he is not near the border but buried deep in the heart of Tehran where they can keep a very, very close eye on him.