I’m intrigued with the suggestion that there were “lost” tribes. They were all there at the Israeli/Jewish Feast of Pentecost, 50 days after the Resurrection of Christ. James wrote to the “Twelve Tribes which are scattered abroad (not lost).”
Christ Himself said in Matthew 10:5-6 for His elected disciples to go to but the lost sheep of the House of Israel, now where did that message of Christ get sent? Further to whom has that promise to Abraham which is where all this got started, that promise of blessings?
So Christ knew who and where those lost sheep of the House of Israel were, however, as it is written even to this day the majority do not have a clue who they are. No matter what some claim.