I think I misstated the item that I have. It appears to be a special portfolio that was provided to a dignitary, Myron A. Wright who was one of the original members of the Board of Governors of the USPS.
It contains a full sheet of the Wildlife issue along with the first day ceremony program from Avery Island and a public relations pamphlet from the Humble Oil and Refining Company in Houston, Texas. It was mailed from Avery Island using a plate block cancelled on the first day. Wright was a Chairman of the Board of that company.
My guess is that the portfolio was created after the USPS officially stood up and provided to Wright after June 12, 1971.