JUNE 6TH.—We have hard work at the War Department, and some confusion owing to the loss of a box of papers in transitu from Montgomery. I am not a betting man, but I would wager a trifle that the contents of the box are in the hands of some correspondent of the New York Herald or Tribune. Our careless people think that valor alone will win the day. The Yankees desire, above all things, information of our condition and movements, of which they will take advantage. We must learn by dear-bought experience.