Keep digging, get the Sanborn maps and start finding privies. I dug almost 100 when I lived in Arizona. This was one of my last from a 13 foot privy in Tucson right before I left 2 years ago. J.M. Wilkins Grocer Tucson A.T. "Arizona Territory" only one known to exist...... good luck
It seems out here in the wild west they had no need to hide there whiskey bottles in outhouse holes, they just though them anywhere. Sanborn maps show nothing in the area I'm working. My sharp eye seems to work best for me.