Unidentified beatboxing species (Men in Black II)

This alien race' s language consists a series of beatboxing. A member of this species was working at a post office in Massachusetts.  

Biology
Almost nothing is known about the physiology of this species, as its only known member was seen disguised as a Human. However, when all the other aliens around him removed their disguises, the beatboxing alien merely stood around, and his species was recognized by scanning his Human face, leaving it possible that the Human appearance is the true appearance of the species.

History
At some point in time prior to 2002, at least one member of this species arrived on Earth for unknown reasons, likely a refugee, was processed by the Men in Black (MIB), and given a job in a Massachusetts post office under a Human disguise. In the post office, the beatboxing alien worked alongside a one-eyed alien, an eight-armed alien, a small-headed alien, and a stalk-eyed two-mouthed alien. Agent K, a retired MIB agent, soon worked alongside them as a postmaster, with no memory of his service to MIB. K worked alongside the aliens without knowing their true identities, until 2002, when Agent J went to retrieve K for help in finding the Light of Zartha. To remind K of his old life, J conversed with the beatboxing alien in the beatboxing language, presumably asking for the rest of the aliens to remove their disguises. The beatboxing alien relayed the request to the other aliens, who all removed their disguises, stirring K's memories. The beatboxing alien presumably kept working after K was reinstated into MIB.

Appearances

 * Men in Black II (2002)