Sam, I think you meant this message for me, R.D. and not Keith. I have built several civil war saddles over the years and two of those were Texas Hope saddles. I can't believe someone who has authored two books on CS saddlery wouldn't know the following: President of the Confederacy Jefferson Davis rode a Texas Hope saddle, Gen. Albert Sidney Johnston rode a Texas Hope saddle, Gen. Joseph E. Johnston rode a Texas Hope saddle, Gen. John Hunt Morgan rode a custom Texas Hope saddle, and even in 1861 Robert E. Lee rode a Texas Dragoon saddle, which is a form of the Texas Hope saddle, he rode this saddle on some of his other horses, than his iconic horse Traveller in which he rode with a Grimsley Saddle. Two union generals that I know rode Texas Hope saddles were Gen. Hugh Judson Kilpatrick and Gen. Eugene A. Carr. These are generals and not just officers riding these type of saddles. Just about anyone serving out west (1850's) rode a Texas Hope saddle at one time and many kept them into the civil war.
Like I said Gen. A.P. Hill rode a "california" variety of a Spanish Texas Hope saddle. The main difference between the "California style" and the "Texas style" was the skirts on the California Style were rounded and the skirts on the Texas style were squared. Depending on the saddlers the horns and riggings could have slight variations. As you can see Texas Hope saddles weren't just made in Texas. Well now to answer your question the A.P. Hill saddle should be at the Museum of The Confederacy in Richmond Va. and it is probably in storage as it not nice to look at. And if it is not there they should know where it's located.