It looks like Royse City PD uses the Rockwall Co Sheriff's freq 155.865. They also have licenses on several other VHF freqs like 155.67 (PD?), 154.175 (poss. fire). Maybe somebody out that way could plug them in and see if they're active. Check out the FCC licenses, click on the call signs and check the FB and FB2 channels;
Royce City Fire-154.1750(PL.162.2/Royce City Police-154.0400--Fate VFD-154.4300(PL.162.2)McLendon-Chisholm VFD-155.3175(DPL.165) Rockwall EMS-155.4000(DPl.243) Hope this helps...
Thanks all for the response. Interestingly, just today the radioreference database has been updated to include the information we have been discussing!