Whether or not there was ever a suicide note or not,what was found inside the pages of the Bible had been on Sheila's bed-side table ?
Like the rifle in the window which suddenly flew through the air and landed upon Sheila 
Did these phenomena occur when there was a sighting at the window ? Was it a simultaneous move ?
This is a perfect example of how you distort claims. The police saw something by a window that they thought could be the barrel of a rifle. This object never moved the entire time the raid team was inside. So it obviously wasn't the murder weapon and there is no evidence it was the air rifle even. A broom or many other things can be described as appearing to look like a barrel of a rifle. The people who saw this didn't even know what the murder weapon looked like at the time they were looking at the window nor did they know when they made their statement because they didn't even go inside the house afterwards.
Had there been a suicide note found police would have noted such right away in support of their theory that Sheila was responsible. The paper in the bible simply had religious crap written on it so far what can be seen and it was presumably written by June.