Here are all the police action report references to the silencer, which all came into being after the nature of the investigation changed/altered on 6th September 1985:-
Action 88 - collection of silencer from Ann Eaton, on 11th September 1985
Action 181 - check silencer for fibres
Action 200 - David Boutflour re cuts and silencer
Action 274 - SOC to examine Agar, re scarring undersides, allocated 18/09/85, to copy
Action 1190 - Peter EATON. Date when DS Jones took silencer. To copy
Action 1345 - see if silencer fits rifle
Action 1537 - T/ST Ann EATON re finding of silencer on 10/08/85
Action 1549 - T/ST HO forensic re properties of silencer. Hard metal