I work at a pet store and my manager was the same way lol. He only changed his mind when i told him the cuvier could be sold for more than the marbled.
The cuvier I got was the one that was mislabeled at my work. After a week and no customers wanting it. not even the ones witj big tanks i bought it lol.
I believe that unless they come from a seller like fugupuff they are mostly miss labeled as maculata.