I had a similar problem with last TSImage (great image!)as normaly the oscam keys go to var/tuxbox/config, but in this image tehy go to var/etc, as all oscam config files.... and they work fine!!
Using oscam you can change the destination in server cfg
Using doscam the SoftCam.Key should be in etc/tuxbox/config
Using ymodt vxx the softcam.keys should be in etc/tuxbox/config