The nicknamed "Black Mailbox" is a single marked postal drop located on the road to Groom Lake and the alleged Area 51, 3 miles east of Rachel.  

The dirt access road past the mailbox leads to the restricted lands surrounding Area 51 and has since been commonly used as a gathering place for UFO seekers. Allegedly, two to three UFO sightings per week occur in the area leading to theories and further speculation of the mailbox's purpose and contents. The mailbox, which is no longer black, is signed to a "Steve Medlin," allegedly, the only person with the key to open the mailbox and the entrance gate into top-secret base.