I am pretty sure that the 15 examples in the Brown Collection are all that are there. I suggested to Herr Friese that these should be included in his book and he has done this. I am waiting for my copy, expected later this month and will do a review when I receive it
On a related matter, Freise is clearing out his office and offering his first-class J Adam Klein print series of Austrian, Russian and Bavarian troops at a considerably reduced price - also Uniformenkunde copies should anyone require any or all of them. They are still not cheap but perhaps more affordable than before and of excellent quality.