Have you got a source ?
Perhaps there is a photo of Sheila putting the silencer away.
I wonder how Mike got the picture of Sheila on the bed ?
sarcasm is not an answer
But if someone
for instance in an OS said they saw Sheila use a gun - and then in a later statement it disappeared then something LIKE that would of course be relevant.
If in her diaries she had written that she intended to take her own life -that would be relevant.
How do they know certain documents exist? I would think they have lists of items and have now realised that certain items are not in the boxes . Its not that difficult is it?
Incidentally I know of a case where a young man has died in NHS care and it has taken 2 years to get to the inquest - and three times the family legal team have been told that they have been given all the documents regarding his care - and guess what three times they have found out this is not true. How do they even know now a week before the inquest that they have al the documents - answer they don't.