I am amazed at how much this web-oriented bunch of sleuths discounts non-electronic modes of communication. A map sent by conventional mail or a phone call from a pay phone is all it would take. Less than that if Steven had been to the area before.
Why would anyone use a payphone instead of their cellphone unless the battery was dead or they expected LE would be looking at their phone records and didn't want them to know about it?
We know the battery wasn't dead, a call was placed to voice mail later.
Also, I don't know how payphones work in this age of cell phones with all manner of area codes. Unless the call was to a local Vegas area land line number, not sure what kind of charges would be for the payphone call (do they still say please enter such and such amount?)
rd