While you wait for new answers, this thread from a few months ago may provide some food for thought. The answer there was: no, and even if they wanted to it would have been impossible.

Also while you're waiting I'd direct your attention to a couple of passages in the CSA constitution. This bit:

No bill of attainder, ex post facto law, or law denying or impairing the right of property in negro slaves shall be passed.

And this bit:

The Confederate States may acquire new territory;... In all such territory, the institution of negro slavery as it now exists in the Confederate States, shall be recognized and protected by Congress, and by the territorial government...

Edit. Got the links the right way round now.