I just read your post and, while I don't know how to obtain the divorce records you requested, I am curious to find out whether your Charles B. Brown could either be the same, or relative of, Charles B. Brown the father of of my grandfather, James Brown (b. circa 1875, Boise ID).
The mother of our James Brown was named Mary E. Brown. While there are a number of these same names to be found in Idaho at that time period, I haven't been able to find proof in any documentation about their connection to my grandfather. Some other pieces of the puzzle that might be helpful to see if your Charles B. is James's father is that that James was a miner by trade of Irish descent. He traveled to Baja California in the early 1900's and later to Ecuador where he died in 1911.
Thanks, in any case,