Not very aware. He may have only realised the rifle with silencer was too long for Sheila on the night.
Thought he was asked about removals/burnings & agreed.
Do you believe he would use a silencer in a silent massacre attempt?
Believe he asked for it to be burnt but will recheck.
In answer to your question, it's a possibility
However the sound moderator on its self is not effective in trying to not disturb the household.
Breaking into a property in the middle of the night even a property such as WHF comes with the risk that the occupants could wake.