However, Oakey did collect items DRB/2 and DRB/3 on that date ...
----------------------------------------------------------------------
Actually, those items were referred to by totally different exhibit references on that date, which later got altered into DRB/2 and DRB/3 etc...
Well now you've spoilt it. I just thought that DRB/1 would likely be collected at around the same time as DRB/2 and DRB/3. 
I don't know - I couldn't follow the story of all the silencers. I'll have to go through it again I think.
----------------------------------------------------
DRB/1 was handed over by Ann Eaton to the police, on 11th September 1985, whether it was handed over to DC Oakey, or to DS Jones, and they have made out a false case for the silencer to have been found in the gun cupboard a month earlier...
DRB/1, D RB/2 and DRB/3, were all handed over to the police on 11th September 1985...
This is very interesting. I'm going to follow this up myself and see what I can come up with.
