After some internet searches I have found that, according to fws.gov
"Other regulations finalized at the same time as the listing and Control Order that restrict possession of Muscovy Ducks and require a permit to sell captive-bred Muscovy Ducks for food will not be administered at this time because the Service plans to revise those regulations in the near future."
link
http://www.fws.gov/migratorybirds/
Also on the fac sheet link
Do I need a migratory bird permit to raise and sell muscovy ducks now?
No. Although we amended the regulations at 50 CFR 21.14 and 21.25 to restrict possession and sale of
muscovy ducks, we will not restrict possession or sale, or issue permits for this species at this
time. As a result of information received since publication of the final rules, the Service has
decided to revise the regulations.
For now, they have regulated the release of muscovy to the wild.
So, I am not going to worry about it but may not get the black & white.
Just in case.