Well I just got a call from Mitaka Police station and it seems my ATM card/s were handed in.
I haven't been to Mitaka recently, so it's all a little suspicious. Anyway...they gave me a 'case' number and I have to go claim them. I applied for new cards, so the old ones are useless anyway.

I thought about waiting for them to turn up, could've saved a bit of cash and time...not to worry.