Look at this page, this whole page is riddled with comms right? Instructions on how to find or interact with some group?

http://www.wildhorsetourist.com/onaqui-mountains

Own a key? I dunno.

"you should never attempt to interact with these animals in any fashion. Even seemingly tame free-roaming horses are easily spooked, and can cause serious injury or death without warning or direct provocation. Additionally, your efforts to feed or pet these animals may condition them to allow others to approach whose intentions might not be as benevolent as your own."

This is good advice for wild horses, but I swear there is double meaning here.