I would have thought that someone would have mentioned the fact that the day after they went to the police station to tell them that they suspected someone else to be the murderer other than Sheila they mysteriously found the moderator at WHF as they were erm...."Cleaning". And with no sense of doubt in his voice Boutflour declared, "This must be the silencer". I find it too much of a coincidence if you ask me.
It was RWB who suspected Bamber from the very beginning and it were he who spoke about Bamber's lust for money who appeared more concerned about the inheritance than anyone else. Bamber hadn't even mentioned inheritance to anyone.
But you will also notice that RWB mentioned that Bamber was in a terrible state although he was drugged up on valium. Yet this is never mentioned by most guilters. I can tell you from personal experience that valium really messes up your mind. Most of the time you walk around in a half conscious state.
But please focus on that statement in RWB's diary that revealed a truly devastated Bamber. There was no world press around then.
The family knew there was a moderator, knew Sheila had no interest in firearms and had not used any before and knew numerous things Jeremy said were suspicious or not true such as that the gun didn't fit in the closet with the moderator attached.
They are the ones tasked with going through everything so them finding it is not surprising.
At the time they found it and turned it over they didn't know Sheila died from a contact wound that would have resulted in drawback, had no source of Sheila's blood, didn't know her blood type and didn't know about drawback so there is nothing to suggest they dad the skill, knowledge and ability to plant the blood in the moderator. Nor could they have removed the blood from the rifle that would have been inside had she been shot by the rifle sans moderator.
These are not minor problems they are sizable obstacles to them planting the evidence. The defense would have loved to find a way to suggest the family planted the blood but had no way to establish such as being reasonably likely. An advocate wanting to try to find a way to see if they could establish such is one thing. That is an advocates job, to try what they can to help Jeremy. Objective people being faced with such would see no reason to believe they planted anything. Unless someone finds evidence to establish such there is no reason to believe it might have happened.