I've been doing a bit of counting and adding just for the fun of it. I've been counting up Shadow radio episodes and here's what I've come up with. I may be 1 or 2 numbers off maths isn't my strongest subject.

214 episodes digitally remastered. These are the ones released by Radio Spirits in the 18 episodes on 9 cd sets.

27 episodes not remastered. Some of these were on earlier Radio Spirits releases but never got on the new sets. A few of them I was not able to find an official release of. This also includes the partial episodes in 1947.

33 missing episodes with recreations available. 

19 missing episodes with Australian broadcasts available.

293 episodes available from the 680 originally broadcast.