I'd be very surprised if another verse exists to that particular song. For one thing, Tom's memory is legendary -- he never forgets the words to anything! I certainly don't remember any more of it, though I will double-check when I get home.
In addition, this song is one of the ones The Boarding Party "discovered." A friend of ours (Andy Wallace) found it in the bottom of an old trunk located in a locked (but not for long) room in the basement of a house he was renting. As far as we know, this is the "original" version and the BP were first to record it.
I suppose it's possible someone has made up an extra verse or two, or perhaps you're confusing it with another song?
In any case, it's a swell song, one of The Boarding Party's perennial favorites.