OK, here's a guess - and only a guess. The copyright info I have for the song shows "1969, 1972". I don't remember where I got that, but I wouldn't have made it up. The illustrated children's book has the two extra verses, and it was published in 1972. So my guess is that he wrote those two verses then, for the book, and has (perhaps) never performed them, sticking to the verses he wrote originally.
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