Investigators at the Mutual UFO Network (MUFON) received an anonymous letter about an incident in around 1982 that could have helped shed light on the ongoing mystery.
The Roswell myth has been at the heart of the UFO scene since in July 1947 the military sensationally announced in a press release it had found the remains of a crashed flying saucer in the desert nearby.
But the following day it retracted the statement, saying it was in fact a damaged US Air Force air balloon.
Witnesses later came forward to say there had been alien bodies within the “crashed craft”, which along with the wreckage were allegedly taken to the mysterious top-secret Area 51 military base in Nevada.
The letter was sent to the US organisation in January, but details have just emerged after MUFON finished investigating the case.
It claims in around 1982, Jose “Che” Teran went into C&M tyre shop on Yarborough Drive in El Paso, Texas, as a customer, and told staff he was “personally involved in the Roswell Crash Incident.”
A MUFON investigation report into the letter by Robert Spearing said: “According to the anonymous report sent to MUFON, Che said he was a truck driver with the US Army from an unknown location.
“He saw a damaged craft loaded onto his truck from viewing out his rearview mirrors. He saw a tarp covering it later.
“He was instructed by military personnel to sign a non-disclosure statement saying he saw nothing at risk of losing his military pension.”
The letter said the story was overheard by a mechanic at C&M.
Che was said to be a regular customer, and would often tell staff the story.
The anonymous letter writer said it had been relayed to him by an employee of C&M.
MUFON, the world’s biggest organisation dedicated to UFO and alien research, has concluded investigating the claims.
Investigators located Jose Che Teran’s stepson Fernando Jimenez, 77, and asked if he knew the story of the Roswell incident with his stepdad’s participation.
However, he was unable to find any living C&M staff.
The report said: “Mr Jimenez, frail and ailing, was sincere and cooperative. However, his knowledge was minimal.
“He could not recall the branch of service his step father was employed with.
“He also stated that he was well aware of the Roswell Crash Incident through television and newspaper accounts but his step-father never discussed the story with him.”
Mr Teran was otherwise childless.
The MUFON report added: “James Clarkson of (MUFON) made a very astute discovery in the course of the investigation.
“The anonymous witness stated Jose Che Teran was a truck driver with the Army.
“His tombstone at Fort Bliss National Cemetery shows Mr Teran was a member of the Navy.
“His participation as a truck driver in the middle of a desert area is suspect.”
The anonymous writer also claimed there was a conspiracy underway, with all online records about Mr Teran infected with a virus.
MUFON found no evidence to back this up.
The report added: “This report is mostly without merit and certainly inconclusive as far as physical or testimonial evidence.”