I believe the police were convinced it was murder/suicide at that point, and explained to the family that the silencer couldn't have been used in the murders because it would have been too long, lo and behold
another silencer turns up with paint, blood upon it.
The family had plenty of time to mark the mantle [which the photographic expert could not see], and the keystone cops fell for it.
buddy, there were definitely two SM's at the heart of this prosecution, the one belonging to A Pargeters Brno bolt action rifle, and the other belonging to the Bamber family owned Anshuzt semi-automatic rifle! I think the cops and the relatives, and to the same extent the prosecution's witnesses got themselves in a bit of a middle, over which SM David Boutflour scraped the flake of blood from using a razor blade! The matter becomes even more confusing because the interested parties are maintaining that there was only ever just the one SM, but this can't possibly be true, for example, with DB/1 (23) sent by Essex police to the Lab' on 30th August 1985, which in that script the ballistic expert, dismantled that SM (DB/1, 22) at the Lab' on 12th September, and he hands the flake he had found inside it, to John Hayward who makes the flake into a solution and tests portions of it for blood group results! These he obtains in tests done at the Lab' opinion 12th, 13th, 18th and 19th September 1985. This is all well and good, but the relatives had got something up their sleeve - you see the Eaton's and the Boutflour found out from A Pargeters that cops had been given his Parker hale silencer, not the Bamber owned one! Pargeter went apeshit with the relatives for handing over his Parker hale SM to the police on 12th August 1985! However, they developed a plan whereby David Boutflour would contact police after the first week in September 1985, informing them that he thought that the wrong SM was handed over to police by his brother in law, because he (David Boutflour) had found the SM belonging to the anshuzt rifle!