Well you were told where to find the info, so not sure what your demand for written proof was for - so hence the search. Vault 87 is in canon now, thanks to Bethesda, whether or not it makes sense in the game's lore is another issue (had to have it though, we needed SMs and FEV to relate to the older games, heh). While there's no explicit statement that FEV only existed at West-Tek and was moved to Mariposa, it does seem logical that it's true.
like i said, ive been looking in those places, and i cant find it..
but before you even clicked on this link you should have read "proof?" which notes im asking for it.
i also mentioned that i dont believe there is any, which means i may have looked before even asking
of course its much easier to say "Look for it your self" when you dont know the answer
The West Tek Research Facility starts working on a new virus to kill the New Plague. Their viral research and close ties to the federal government eventually lead to them being chosen for the Pan-Immunity Virion Project twenty years later as well as Power Infantry Armor and laser research
QUOTE (Fallout Timeline, 2073)
September 15: As China becomes increasingly aggressive with their use of biological weapons, the United States government felt that a countermeasure was needed. The Pan-Immunity Virion Project (PVP) is officially formed and plans are made to begin experiments at the WestTek research facility in Southern California
QUOTE (Fallout Timeline, 2075)
March 21: PVP experiments continue at West Tek with batch 10-011, in the wake of successful tests of the virus on single-celled organisms. Experiments on plant cells are postponed. The pan-immunity virion is renamed FEV - the Forced Evolutionary Virus.
May 9: FEV experiments continue at West Tek with batch 10-011, in the wake of successful tests on flatworms, the flatworms exhibit increase size and heightened resistance to viral contagions. Experiments with insects have less success, and further experimentation on insects is postponed by Major Barnett.
June 30: FEV experiments continue at West Tek with batch 10-011, with white mice as subjects. Increased size, muscle density, and intelligence are noted.
November 9: FEV experimentation (batch 10-011) on rabbits is concluded. Increased size, intelligence, and (this time) aggressiveness is noted. Apparently, it was hard to determine whether the flatworms in the previous experiments were angrier and more violent than normal. Frankly, the researchers cannot be blamed for this.
QUOTE (Fallout Timeline, 2076)
April 15: Once all secondary tests and studies are done on the test subjects, all dogs from the batch 11-101a FEV tests at West Tek are terminated...from a safe distance
QUOTE (Fallout Timeline, 2077)
January 7: Major Barnett orders transfer of all FEV research to the newly-constructed Mariposa Military Base, despite objections by the research team
again, im looking for conclusive eveidence that it didn't exist anywhere else, not evidence of where it did exist. thre is a difference.