That's true of any bible text we have. The original texts are lost, hence biblical exegesis and hermeneutics exist as disciplines. And which "canon" are you talking about? The 5th century canon before the East-West schism of the Eastern Orthodox-Catholic church? The 16th century canons of the Roman Catholic or the Church of England? There are a lot of canons out there.

By fake I mean made to look older than they are; and possibly planted in the caves.

And note I said "not far-fetched"; not likely, just less improbable than previously.