I looked at the above Facebook post as well, and it does sound like the Coconino, AZ Sheriff is doing the right stuff. We get one of these every couple of years in San Bernardino County, CA where I volunteer with SAR. It's as much a job for the detectives as anyone. Until they locate his vehicle, they will be trying to establish if he entered a national park, got gas, or got beat up a block from his house. Once they have at least a direction of travel, things will move a lot quicker. Until then, the best ExPo folks can really do is call the Coconino Sheriff if they think they saw him or his truck over the weekend.
Arclight