First off, welcome to the forums! Someone is going to give you a piece of fried fish sometime soon.
So, let me ask you how you figured out these files even existed? The Morrowind assets are in a bsa file, so did you unpack it? Or, are these loose files in your sound folder? If they are loose files in your sound folder, then they weren't added by Bethesda; they were added by a mod. If they are bundled inside the Morrowind.bsa file, then they were added by Bethesda and perhaps just not used in the game. Maybe something they intended to use but then didn't.
In either case, having a few extra sound files is not going to harm your game. They are inert unless called upon by an esp/esm file. So you don't really need a patch for this.