I suggest you swing by the Opelousas Museum & Interpretive Center and ask for Ms. Sue DeVille. She may be able to help you find what you are looking for and she is always very helpful and supportive of folks researching Confederate ancestors.
You can also contact the General Alfred Mouton Sons of Confederate Veterans Camp there in Opelousas and ask them to help. Here is the address for their website. Their email is listed there...