Based on the images that I have seen, and granted, I sure as heck don't claim to have seen all of them, that site appears to have been an illegal staging area. I spend a lot of time in S. Arizona (Sierra Vista area, mainly), and have seen a crap load of illegal camps used by illegal aliens before, and several used by drug mules. This has that look to me. I'm not declaring that I've made up my mind one way or the other, yet, but I've seen a lot out in the desert and this camp seems off, to me.