Have you tried searching with a scanner that does not mute encrypted transmissions like a GRE or Whistler? I their comms are encrypted a uniden will skip right over them and you will not even know they are there.
Last time I was in the area, I got a few hits on their P25 system. Seems the CC channel per database is correct but as Tim-B said; no audio so my guess is encryption. I was mostly listening to Bossier on LWIN and Caddo's 800 system so I didn't pay that much attention to it. I'll pay more attention to it next time I go thru there.