I'm sure you know that they have become a hot topic on some of the FB pages locally (if you even mention them, about 50 self-appointed land police will remind you that they are on private land, etc), and that one of them collapsed.
I'm relatively new to this area of AZ, but it's my understanding that they have been "private property" for decades, but enforcement was lax. The new owner(s) have been much more aggressive in trying to keep people out...to the point of calling sheriffs and supposedly brandishing a shotgun.
I went once, about a year and a half ago...shortly before they became a hot topic again. I saw all sorts of older posted signs after I was already there, so at that point, I stopped, took some pics, and left and will not be returning. They are cool relics, but the beautiful terrain surrounding them is even more so, and open to exploration...so no point in breaking the law and drawing the ire of the owner with so much else to explore.