This is a topic of much concern as to where they are. There are many, many sites proclaiming they know who the lost sheep are. So much so, that there are way too many sites with prejudicial motives behind it. Which goes to show that these are not the true people of Christ.
If people would "wake-up" and realize who the true children are, it would stop alot of this. (Satan has gotten people so roused up with all this evil). All who are the true believers in YHWH through his Holy Blessed Son Yeshua (Jesus). Paul even tells us this! Those who are of the SAME faith as Abraham are the children of promise. Read Galations & Ephesians very carefully! Christ NEVER taught racism! He judges by the heart of man! Where is it written that only middle eastern, blacks, whites or asians are the lost sheep?
Many people quote Matthew 15:24 where Jesus is telling this Canaanite woman that he was only sent to the lost sheep of the house of Israel. If that is the case, then why did Jesus help the Roman centurion in Matthew 8:5-13? Jesus never told him that he was only sent to the lost sheep.
If people would go back through history, and really examine historical references as well as biblical references, they would see the truth that after the Assyrian invasion which removed the 10 northern tribes as well as Jews living outside the city of Jerusalem and dispersed them in and around the area of the Medes we could go from there. Many went north of there, many went northwest, many went south as well as into India. Another thing that history shows us was that during the time of Jeremiah, many Jews (Judah, Benjamin & Levi) went to Egypt to escape from being taken captive at Babylon. Many were brought back from Babylon but not all returned. Also the Septuagint was translated by 70 Hebrews which equates to about 6 from each tribe because of the greek speaking Jews in Egypt. There were many Jews living in Arabia & Yemen too.
In conclusion, I firmly believe that numerous whites, blacks, hispanics, native americans, asians, arabs, persians, India as well as many others are the children of the lost sheep of the house of Israel. Read Galatians 3:6 again.