They were originally included in the first Shogun, but left out for the final release. If you peruse through STW directories, you'll find many files pertaining to them that were never deleted...............
I could have sworn I remember hearing or even trying that if you played the films from the STW folder (I think I was able to do it in some windows application) among them would be the Chosokabe diplomat in the throne room. I could be wrong, but my memory seems to recollect this.