MVS Cart Serial #'s

Are these numbers only found on the shell and box? I tried looking on the PCB but didn't see anything, if it exists on the PCB where exactly is it?

Thanks

just the mvs label, and the kit label. each rom? way too much time spent.

The rom chips have the game # on them for most games. The game number is different from the serial number however. Also, some older games have silver serial numbers in a number of different places. I've seen some on top of the label, and some on the side, sealing the game from being opened without voiding the warranty.