i was hoping to find one but idk if thats something really worth pursuing. not sure i could really do anything with itThats a non-original coin plate, the original plate has blue artwork painted on similar to the original control panel.
The reason for their being two cut-outs, one on either side of the coin slot is that taito offered an optional "TCR" (Taito Card Reader) system on these cabs. this allowed you to load up credits on a magnetic card that would be inserted where the rectangular metal plate is on the front right of the control panel box. and the second cut-out next to the coin slot would have a digital counter showing the credits the player had on their card. The small square cut-out next to the card slot was for an IR window. Not sure what this was used for but I'd guess so operators could interact with the TCR somehow.
I've never actually seen a complete TCR system though I have come across one or two people who have part of one still in their E29