And also to add I do not think he was mistaken, to describe it as such would not convey my opinion, I believe he is actively lying in order to bolster his argument.
Just as he did when he informed us that Ann Eaton took blood soaked clothes home for whf, he cropped a page of Ann's statement, if he hadn't cropped it then we would have seen the next line which shows Mike to be actively lying in an attempt to deceive people.
So yes that's it. You have irritated the hell out of me though, but I'll calm down in thirty seconds. 
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Ann Eaton has lied about handing the silencer over, she knows she gave it to the police on 11th September 1985, and that the relatives have conspired with police officers (in particular their best friend DS "Stan" Jones) about the silencer being found a month earlier. Eaton knows the truth and she is hoping that no evidence surfaces which proves that the relatives deliberately contaminated the silencer by scratching it against the paintwork of the aga...
David Boutfloyur also has lied, because he did not contact the police until 11th September 1985, to inform them that he had found a silencer in the gun cupboard at whf - he would hardly wait a month before choosing to report the find of a silencer a month previously?
I don't have to lie, the relatives and the police have made such a good job of it all by themselves...