I don't know, but from looking at Andre's schedule, he was there the first week of January. He faced Kamala on 1/1, in San Antonio, which was a Sunday. It's possible that they could have ran Corpus that afternoon, as it's only a couple hours from SA to CC.
Also, Corpus would run on Thursday's typically during the Southwest days. They had a card on 1/5, in Jacksonville, TX, which Andre was not on, so it's possible they could have ran Corpus that day, and then he makes it to Dallas for the 1/6 show.
Was trying to search in the Corpus papers, but haven't found anything yet.
I went back and looked and they were in Corpus on December 29 1983. So they likely returned a week later and this card was on the 5th like you said.