Your probably correct, that they may have moved to DMR.
Look at this license in the database:
FCC Callsign WQSR647 (ESCAMBIA RIVER ELECTRIC COOP)
www.radioreference.com
That's licensed as trunked, five sites across your county as well as Escambia. Three frequencies per site; as the frequencies are different, it apparently is not simulcast. It's licensed for analog voice, as well as DMR. My guess is that DMR is being used.
Which scanner do you have?
If it's one of the Whistler database scanners (or an older GRE database scanner, upgraded by Whistler), then create a DMR trunked system in EZ-Scan, with each set of frequencies (three per location) set up as a site, leaving the color code set at 'any'. Add a wildcard to the talkgroups, and see what pops up. If they are using it as DMR, you should see activity show up from any of the sites in range for you. If you set the wildcard to record, you'll be collecting audio clips of the transmissions, which you can then review in the Audio tab of EZ-Scan. Sort them by talkgroup then play a collection of files for a TGID. As you collect more activity, you may begin to pattern to determine specific usage. Like one TGID is only used on one specific site, and any addresses referenced are in a certain area. Or another TGID is used for power outage repair. Whatever information you can collect & verify, whether talkgroups in use or color codes used at each site, submit it to the database.
If you are using one of the Uniden scanners with DMR upgrade, your steps will be somewhat different.