A lot of people would have kept quiet about mental illness back then as it wasn't recognised as it is today. The neighbour who'd reported screaming in the early hours would have been one incident reported then her behaviour at WHF was obviously cause to request assistance which it could well have been mentioned about the guns on the premises then especially if the boys had been there.
My argument is why keep anything until 2054, what's the point in that ? Though the object is that JB will be dead but it all seems very iffy to me. Why wait until then ? I haven't come across this before exect when innocent people were hanged, then posthumously exonerated years later which is no use to anyone least of all relatives of the dead who'd be dead themselves.
Lookout, I truly don't know anything about a neighbour calling emergency services because of screaming. For one thing, the Folkes were trusted employees and good friends of the Bambers. They'd have made it their business ,HAD they heard screams, -and I emphatically believe their house to have been too far away from WHF, for a scream to have carried that far- to rush to the Bambers to offer their help. I also believe, HAD such occurred, that both the housekeeper and the farm secretary would have known, if only to ensure they knew the truth, NOT Chinese Whispers.
As to why is 'stuff' being held until 2054? Well, okay, I'll be sorry not to be around then, but at the end of the day, it's none of my business, really. The family, whose concern it is for now, will be another 3/4 generations down the line and eventually, although one or two of them might show some interest in their past, it will fade into the mists of time.
