I used to work on a ranch south of Colorado City. I never saw any mule deer, and never heard people talk about seeing them either. I did see a couple of javelinas, but I think they are pretty scarce in that area too.
I have hunted two properties in Coke for a total of 13 years combined. Never seen a Mule deer or Javi. Have seen a couple of Javis hit on the side of the road near Oak Creek Lake and a few guys have had some game cam pics of them on the place I hunt now though.
I have always heard that what few Mule Deer are in the county are in the south west corner of the county.
the reason coke county has a mule deer season is the Texana ranch down the road from me near Blackwell. They have mule deer on their high fence place. they did a government deal years ago where they traded a ranch in west texas turkeys for mule deer. They have a web site with them on it. That's the only mule deer in coke county.