That's why I think it is so important to watch this documentary if you haven't already seen it, Simcha Jacobovici's "Quest For The Lost Tribe".
http://www.imdb.com/title/tt0246878/
Produced in 1997-8 and released in 1999 by award-winning documentary filmaker Simcha Jacobovici, now producing "The Naked Archaeologist" series for the History Channel, it deals with the lost tribes of the Israelites, scattered by the Babylonians 3000 years ago.
Jacobovici had produced a documentary about the Falashas, the Ethiopian Jews in 1991. After it's release, he was contacted by a rabbi who said he had discovered people practicing Jewish traditions in the Golden Triangle Area of northern Burma/Thailand/southern China. So he decides to try to find all of the ten lost tribes of Israel using nothing but his knowledge as an archaeologist and biblical scholar and the Old Testament as a guide. Over the course of the program, he finds tribal remnants of Israelite populations in Burma, India, Tunisia and the Tribal region of Southern Afghanistan/Pakistani Northwest Frontier. Specifically, he links the Shinwari, Afridi, Ruveni and Gadun tribes to the Israelite tribes of Simeon, Ephraim, Reuven and Gad.
He also examines the Pushtun-Wali, the Law of the Pushtuns or Pathans, that predates Islam and compares it to Old Testament Torah and finds it eerily similar. He does most of this by actually traveling around the area in the time frame where the Taliban are taking over.
It's an incredible historical document which, if it can be proven(can you say DNA testing), could change the entire dynamic of the area and the Middle East on one stroke. For if his thesis is correct and can be proven, it would mean every member of those tribes, some six million strong, are all entitled under Israeli law to "The Right of Return".
Here's another link to some commentary on the program:
http://www.nazarite.net/discovery/lost-tribes.html