"Robin, it must surely follow, that by 20th September 1985, a silencer bearing the exhibit mark DRB/1 not only existed, but moreover, police had possession of such a silencer, otherwise, how could they possibly allocate exhibit marks DRB/2 and DRB/3 to other items, police sent to the lab' on and by that stage - a silencer bearing the mark DRB/1 had to exist as of 20th September 1985, but there is no official police record confirming its existence, and that is somewhat puzzling"...