Photographs of the silencer were taken by EP on both 20/9/85 and 13/11/85. However, the silencer was in the custody of Huntingdon labs when these photos were taken, which seems a bit odd. Not sure whether this relates specifically to DRB1. Also strange is that the police request that the silencer is submitted to the lab on 20/9/85 (presumably after photographing it), yet it is already there :D