Now here is what I find interesting. In 1982 (Sunshine Dreams) and 1984 (Pet Sounds tape and LP), WIBN is in mono, and not a fold-over mono. So when exactly was the master reel lost? Also, WIBN released by Warners in the 70's was duophonic. SO who knows what happened there.
No, WIBN is mono on the Warners pressing. There's two versions of the 80's green label capitol, one with WIBN in mono (presumably the NY tape) and one with it in duophonic.