These letters may not exist. Here is the paragraph from "Shelby and his men by John N. Edwards" for the people that do not know what we are talking about
General Shelby camped his command one night, on the upward march, around the house of Captain Leeper, and, after taking charge of his forage and supplies, looked also to his papers and official correspondence, among which was an order signed by this Major Wilson, directing Leeper to take eighty men, dress them in "butternut" clothing, march with them to White river, find out the intention of the "rebels" under Shelby, and on his return burn every mill, building, grain stack, and hay rick on the road, closing mysteriously with the following words underscored: "And you know I don't like to be troubled with prisoners." Among other letters were quite a number from the Hon. Charles Drake, United States Senator from Missouri, urging Leeper to do his work thoroughly and well. These letters, together with Wilson's, are now in the hands of ex- Governor Thomas C. Reynolds, at present residing in the city of Mexico, but who will, in due time, present them to the world, with other startling and damaging facts concerning the atrocities perpetrated by Federal soldiers in Missouri.