How much is the authentic gray cart worth? I recently bought an authentic Chrono Trigger for SNES from a friend for $40. However, it had no label at all. It was a completely blank cart. Apparently he wasn't the most well behaved kid and swapped the labels of another game he had and returned that to Blockbuster so he could keep Chrono Trigger. 

I bought a repro label and it looks good. I've been exploring the option of putting it in a cool colored transparent case because I love how those repros look. 

So if the label is gone, is all of the remaining value in the game board? If that's the case should I spruce it up with a cool looking cart?