Lets approach this matter, on the basis that there was only ever just the one silencer, and that it had all these different exhibit references, (SBJ/1, SJ/1, DB/1, AE/1, CAE/1 and or DRB/1) and lab' item no.'s 22 and 23, in whatever permutation that occurred, 22 to 23, and back to 22. Lets imagine that this silencer had been sent to the lab' and examined by experts on all those / these different occasions (13th August, 30th August, and 20th September 1985). Lets pretend that it got fingerprinted by DS Davidson on 9th August 1985, and by DS Eastwood and DS Davidson on the 13th September 1985, and by Ronny Crook, on 15th and 23rd August 1985...
Now, consider the following:-
There was no documented records to show or prove that this silencer was ever placed into secure storage between 13th and 30th August 1985, no safeguards put into place to ensure that this silencer could not possibly be contaminated innocently or accidentally. No, Sir, instead what we had was Ronny Crook carrying this silencer around with him, inside his grubby coat pocket everywhere this scumbag went for the entire duration of that / this 18 day period. Crooky even returned to the crime scene on 14th August carrying that silencer around with him in his grubby disgusting coat pocket. it was not in any protective packaging, it was just tossed into his coat pocket inside which he had often plonked his contaminated grubby hands at one time or another whilst touching, moving and collecting exhibits at the scene. Lets not forget that Crooky admitted to moving Sheila's bloodstained right hand and her bloodied right arm when sheila's body was insitu, so that PC Bird could photograph the bloodied hand impression upon the front lower right hand side of her nightdress.
Don't overlook that Crooky did not wear any gloves when moving the rifle from Sheila's body and he having placed that blood stained rifle back at the bedroom window where WPC Jeapes had seen it resting prior to entry by police, into the farmhouse, was surely contaminated in one way or another by performing these and similar duties at the scene on 7th and 8th August 1985...
Lets put it this way, not even the keystone cops would be daft enough to carry what turns out to be arguably the most important exhibit in the entire investigation, around in their pockets for 18 continuous days and nights. Think about it, what a truly bizarre set of circumstances, why would a DI go to such lengths. I have to say, that I do not for one minute believe that Ronny the Crook did, he is and was a lying scumbag, no police officer worth their own weight in corruption would have dared go to such lengths. Crooky, has definitely made up a story about the only silencer in the entire investigation not being placed into storage at all between 13th and 30th August 1985, but rather he chooses to take full responsibility for carting this sole silencer everywhere he goes during those / these 18 days and nights, until he finally sends it off under the guise of exhibit reference DB/1 to the lab' on 30th August 1985, under lab' item reference 23, without so much as any explanation how he came to change the exhibit reference, and the lab' item reference number, from SJ/1 (or whatever) lab' iten 22, on 13th August 1985, into exhibit reference DB/1, lab' item reference number 23, 18 days later, whilst all the while that / this lone silencer was being carted around like a badly reused durex, it was inside his coat pocket with his bogified handkerchief...
Give us all a break, the geezers having a laugh, isn't he?