The government doesn’t have it.
The CIA and its affiliated defense/industrial corporations have the good stuff.
Been that way since about forever, at least since WWII.
This is what Eisenhower was warning about, obliquely.
JFK tried to break up the CIA/corporate cabal and get the UFO package under his control as POTUS, so he could compare notes with the Soviets, make the moon mission a joint effort and end the Cold War.
Bobby would have done the same thing.
Will the cabal carry out more assassinations to keep its secrets?
As many as it takes.
You are right on the money.