Yes I agree Jane it's my opinion, putting the silencer in the cupboard was stupid beyond belief but that's my opinion. You may say well why not? Adam says it's not part of the crime scene? oh well.
I'm simply going by the circumstances, Rob. From his first moment of contact with police, JB had implied that -according to his father- his mentally ill and, thrown in for good measure, potentially suicidal sister had managed to get hold of a loaded gun. He spent a couple of hours outside with them, reinforcing this. Hardly surprising then, finding Sheila dead, with a gun draped across her, that they accepted what JB had said. Not only that, Taff Jones, he who must never be challenged, was equally convinced by JB's story. Who were they to gainsay it?
The above, in my opinion, is exactly why a 'finger tip' search wasn't made. It wasn't considered necessary. What suicide was going to use a silencer to shoot a family, then remove and HIDE it before taking their own life? Why would they even bother putting it away? Imagining a potential suicide's frustration when the realize that they can't finish the job with a silencer attached, wouldn't they be more likely to detach and toss it aside?
With the clarity of hindsight, I agree with you that it was a stupid thing to do, but I think we have to allow JB a moment of wobble here. SO close is he -indeed, just one shot away, perhaps- from attaining his goal, when it looks possible that he could fall at the last fence. What are his options? He could take it with him and throw it in the river, but how long would be before it was missed? At least if he placed it back in its box, it wouldn't arouse suspicion.
Adam isn't wrong in his claim that it wasn't part of the crime scene...................according to some, it was never part of murders, either.