Descending the summit, SR 375 nears the border of the Nellis Air Force Range. As the highway heads northwest through Tikaboo Valley, it meets Mail Box Road. It used to be marked by a single postal drop known as the "black mailbox": the dirt access road leads to the restricted lands surrounding Area 51. The original mailbox was a normal black mailbox, however due to people constantly sifting through it, it was replaced with a white one that was much more secure. The name "Black Mailbox" still stuck. It was commonly used as a gathering place for UFO seekers, and two to three UFO sightings per week allegedly occur in the area. The mailbox was removed by its owner, Steve Medlin, due to continued vandalism. SR 375 continues heading northwest from the mailbox, climbing in elevation again to reach the top of Coyote Summit at .