Actually, there was one sneaky way that you could see what was on your card on the MVS cabinet! And I did it back in the day.
Basically, you have to purposely have your card completely full. As in, it has to have no empty positions left on it for saving. Then, go to the arcade and play a game. Like say Fatal Fury or Art of Fighting and get to at least the second stage. (beat the first CPU fighter) then when your game ends, the continue counter counts down, and you get the game over screen, it will ask you if you want to save. Choose yes, and the screen then changes to your memory card list of games saved and says “memory card full please select which file to delete” or something like that. And you can fiddle around through your files for awhile.