I don't agree Adam, I don't think a silencer was used that night, as you know.
If he did there was only one place to leave it and that's NOT in the cupboard especially as he would have blocked the route to the den by placing Nevil in front of the kitchen door.
Both supporters & guilters agree Bamber would use a silencer in a silent massacre attempt.
Both supporters and guilters agree Bamber would take the silencer off after shooting Sheila. As the rifle would be too long for her otherwise.
Both supporters & guilters agree Bamber was not aware of back spatter or the aga paint.
Both supporters & guilters agree putting the silencer back in it's usual place is as good a place as any.
Bamber had access to the gun cupboard. Otherwise that would have been mentioned in the last 36 years. You are claiming this to support your own theory.