I have just acquired a 507 wall box which appears to be in pretty good shape but does not have a key The SN is 760342. Anyone know what standard key this wall box needs and a good source? I will buy a manual and go through that before I ask my really dumb questions, as I do have a 460 with a receiver but I have no real idea how these connect. Right now, I'd just like to see the inside.
Patrick