What makes you think this?
Several members of his family are in Iran. I would not be surprised to find that he is there.
On the other hand, Baluchistan crosses the frontiers of three countries, and gives him the chance to move from Pakistan through Afghanistan to Iran as he needs to. So maybe you're right.
I've done a number of posts on this subject, check out the whole thread:
http://www.freerepublic.com/focus/f-news/1481416/replies?c=1
Also, the Baloch are semitic sunni arabs, Khaleed sheikh Muhammed and Ramzi bin alshibh were Baloch. Iranian Balochistan is fairly autonomous and bin Laden was in Ladeen, Iran after Tora Bora. At least two of his sons are in Iran, smuggling, and training Baloch.