WHAT DO JWS BELIEVE ABOUT THE LOST TRIBES OF ISRAEL?

It fits in nicely with the JW doctrine that Jesus went to all of the 12 tribes.
It actually doesn't conflict with the scriptures to say that there was no
lost tribes, but that all Israel came back from captivity to Babylon as one nation.

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w72 7/15 pp. 442-443 The Ten Tribes—Were They Lost?***
DURING
AND AFTER THE BABYLONIAN CAPTIVITY
It is not surprising therefore, to note that, while Ezekiel was sent to those primarily of Judah in captivity in Babylon, he mentioned "Israel" more than twelve times as often as he referred to Judah; significantly the "house of Israel" is mentioned some eighty times, some thirteen times as often as the "house of Judah." All this is in keeping with Ezekiel’s prophecy that the two houses would be united and become one. (Ezek. 37:19-28) And the prophet Jeremiah indicates that both Israel and Judah were in Babylonian captivity.—Jer. 50:33; 51:4-6.
It is not surprising, therefore, to note that after the Babylonian captivity no distinction is made between the two. Thus in the books of Ezra and Nehemiah some sixty times the term Israel is used in referring to the ‘Jews’ that returned from Babylon. (Ezra 2:2, 59, 70; 3:1, 11, etc.) Proof of this is seen in the fact that the ‘sons of the exile’ offered sacrifices not just for the two tribes of Judah and Benjamin, the "Jews," but "they presented for the inauguration of this house," the rebuilt temple, hundreds of animals, "and as a sin offering for all Israel twelve male goats, according to the number of the tribes of Israel." Clearly those returned Israelites considered themselves representative of all the twelve tribes. (Ezra 6:16, 17) And this is in harmony with the prophecy of Isaiah, who foretold: "For although your people, O Israel, would prove to be like the grains of sand of the sea, a mere remnant among them will return." Yes, a remnant of Israel, not merely of Judah, would return.—Isa. 10:22.
IN
THECHRISTIANGREEKSCRIPTURES
That all twelve tribes, or both the nation of Israel and the nation of Judah, would be on hand when Jesus presented himself to his people was also foretold by the prophet Isaiah, for he wrote that Jesus Christ was to be "a stone to strike against and as a rock over which to stumble to both the houses of Israel." That this prophecy had fulfillment in Jesus Christ is vouchsafed for us by both the apostle Paul and the apostle Peter.—Isa. 8:14; Rom. 9:31-33; 1 Pet. 2:8.
That the term "Jews" in Jesus’ day included both those of the ten tribes and those of the two tribes is apparent from the way the Christian Greek Scripture writers use the term. For one, the apostle Paul refers to "our twelve tribes" and their "sacred service," (Acts 26:7) and speaks of himself as both an Israelite and a Jew. (Rom. 11:1; Gal. 2:15; Phil. 3:5) And so those to whom the apostles witnessed were at times called "sons of Israel" and "men of Israel," and at other times referred to as Jews. (Acts 5:21, 35; Rom. 9:24; 1 Cor. 9:20) Thus also Jesus was called both "King of Israel" and "King of the Jews."—Matt. 27:42; John 1:49; 12:13; Matt. 2:2; 27:11, 37.
Moreover, the prophet Jeremiah foretold that Jehovah would "conclude with the house of Israel and with the house of Judah a new covenant." (Jer. 31:31) Jesus mentioned this new covenant with his followers on the night of his betrayal and sentence to death, even as we read at Luke 22:20. And the apostle Paul shows that this new covenant is the one into which Christ’s footstep followers are taken.—Heb. 8:7-13.
Clearly, then, neither secular nor sacred testimony can be appealed to to prove that the Anglo-Saxon people are the "Ten Lost Tribes."

Tuesday

I thought the general consensus was that they were assimilated into the rest of the nations around there.

LouBelle

Didn't they spiritualise the tribes of Israel - so in that sense they would be lost and the annointed make up those 12 tribes spiritually. Along with the spiritual Jerusalem.