What I think would be very useful for this topic for this time period would be an online search a retrieve against any of the newspapers in that time frame. From what I have been able to access, however, neither the Globe nor the Dispatch, nor any other paper, covering the war period is available on line or by my visiting the actual local libraries. There actually turns out to be one intriguing newspaper article directly germane to this topic that I stumbled upon from some other on-line news-clip which had picked up an article from the "St. Louis Democrat" of November 26, 1869 indicating that some of those who had been assessed were seeking to sue one of the board members. That board member had been a prominent, well-respected lawyer and he was still held in that regard after the war. There is no doubt that some of the persons he had assessed during the war had been his close associates before the rebellion, and some of those same old-firendships were, no doubt, renewed thereafter. In this case, however, the assessed were trying their own interpretation of the 'fuzzy line' between martial and civil lay -- they were no suing him as a private citizen of wealth, not suing the government or even him as a government representative.
The person to whom this refers is named Franklin Dick, and it is his notes on the "Troubled State" that were published in 2008. Since the book sells for upwards of $35.00 and is not found on any of the usual book store shelves, I have not opted to buy it. If anyone who has purchased that text has recommendations, pro or con, those observations would be appreciated.