Mad Matty boxes are stock that is A) plenty of Costumer service stock left, B) hasen't really seen a rerelease. So i can see it being likely TMS is in a matty box, being a low production run and wrapping up of reissues i could also see there not being much stock either side. it has nothing to do with a figure being "popular" popular characters like Bow, Vikor and so on where there, the main myth of where this comes from is Mo-larrs but that was a PR production run, not a regular matty sale day run, it was meant to go to a retail stores at one point but was dropped leaving matty with extra stock. it wasn't much to do with how popular it was.
Either and as others have said, way mattel would have to be the nicest company in the world and not won't money to pull stock early to help one employee save face... and they ain't that