I'm not surprised that none of the control channels have been marked, or that the urban city dwellers haven't been out to monitor any of those sites. Listening to the scanner is fun, but would you drive 3, 4, or more hours to monitor a trunking system that gets very little use?
I spent a July and August last year driving through a lot of these very small remote towns for work. I had the scanner on, but heard little. It may be that the frequencies listed were wrong, or that there just wasn't any traffic on them. The one day that I drove through the most remote cities every other week I was kept very busy. As a truck driver I'm only allowed to be on duty 14 hours a day, and it was always a struggle to drive, make my deliveries, and finish under the 14 hour rule. I didn't have time to stop and play with the radios much if at all. They have changed the delivery schedule now, and next time I get sent up that way I'll have to do some more research.