So the scope and the CES ARE a "civilian put together" and not part of the Enforcers life in the Police force.
The fact that the Police required a night-use marksmans rifle makes sense and I can see that the addition of the pads to allow the use of the L42 night sight bracket could well have been done by the Police Armourer.
It was the rest of the bits and pieces that made the story unlikely, but from your 'provinence letter' it is obvious that they were not related directly to the rifle.
Did you get the IWS scope mount with it ?