Exactly, as sources indicate #4 was canceled, and the others are accounted for. Scratch MOGUL.
They were silenced as their later testimony indicates. Edwards mentioned the caee in his '66 book but noted people weren't talking---yet.
But still evidence, especially if a witness is deemed credible.
As I've said before, there are good grounds for thinking the government has craft or material, as witnesses have reported confiscations and not just at Roswell. (Note I didn't say PROOF, but still evidence so people shouldn't make categorical statements like that.) There is ample evidence for the existence of strange craft as witness testimony, radar sightings, landing traces etc indicate.