The only country that had control over the box art and labels in the Americas was Gradiente (and its subsidiary Playtronic), Brasil. It's been seen on plenty of games.
The rarest I've seen besides that, are unreleased games in Mexico, and different seals with even extra translated booklets, but never a different art box, that happened only in Brazil. (Besides the polemic Venezuelan counterfeit Nes releases)
Since they started (Brazil) they've been a bit too much rogue on their own and had full control on their boxes and labels, even after Nintendo approved them as official distributors (they started counterfeiting Nes games and reverse engineering the system). It's not Ntsc per se though, those were Pal M engineered. But if I had to bet, that would be the only one place where they did that. Brazil. Evidently those games were also sold in other places like Argentina and countries near them.