They did know. Just go read it and look at the nature of the statement, I simply stated the obvious. Due to the nature of the allegations the defense made they had to ask.
You've lost me?!
I hadn't realised until recently AE made a WS on 14th Aug 1985. Do you have a copy you can post?
COLP asked AE in 1991 why she didn't mention the finding of the silencer in her WS of 14th Aug '85 I have thought in the past it didn't seem right that DS Jones didn't take WS's when he collected the silencer from all those who were present when it was found on 10th Aug and subsequently handled it until he collected it on 12th Aug. When did DB, RB, PE, BW and BC first provide WS's and did they contain info about the silencer?
Why would any member of EP tell AE what to include and exclude in a WS let alone tell her to exclude the silencer which just happened to end up being the most incriminating aspect of the prosecution case against JB. Why would AE exclude the silencer when according to her WS's taken in Sept she immediately grasped the significance of it:
"We discussed the implication of how this silencer could be in the gun cupboard with blood and paint on it. Obviously if it was being alleged that somebody had had a brainstorm and shot dead four people they would surely not have stopped to remove the silencer, put it back in the gun cupboard, go back upstairs and shoot herself dead".
Anyone reading AE's WS's will surely appreciate she has a mind for the minutiae whereby she includes a lot of trivial, petty and irrelevant detail. Why on earth would she omit the silencer?!
You surely don't need to be police trained to realise that if you get a call saying words to the effect 'we've found the silencer to the murder weapon, it has blood and paint on it' that an officer would arrive with an exhibit bag and appropriate stationery for taking witness statements. DS Jones wasn't pushed for time since he was happy to wile away the evening drinking whisky with PE as per AE's COLP WS. DS Jones went empty handed: no exhibit bag and/or stationery for WS's or if he did he didn't bother taking any and he took the silencer away in a kitchen roll tube supplied by the Eatons I assume.