I take it you are refering to the Official Records of the War of the Rebellion, a truly massive work of over sixty volumes.
Now is there anything in there guaranteeing that a slaveowner would be able to keep slaves forever? Do you have a page in mind, or are you just pulling my leg?
Who would have the authority to issue such a guarantee? Maybe what you're thinking is that because the Emancipation Proclamation declared that some slaves "shall be then, thenceforward, and forever free," that there are documents somewhere ordering that the others should remain forever enslaved, but, so far as I know, there aren't.
NOTHING was so low that they wouldn't try it as a "method of waging war". as i said: so much for federal guarantees.
free dixie,sw