they wouldn't of known what Neville did with his guns they dident live there.
AP found the gun in the closet with the scope and moderator attached. He put it away in the same manner. Nevill would have zero reason to ever remove the scope. They knew about weapons and thus knew that if you remove a scope you must re-zero it. You only remove a scope if you are putting a weapon away for long term storage. There was no reason to even remove the scope during cleaning. The barrel of the weapon could be removed without any need to remove the scope.
The moderator would be removed for cleaning but would be reattached. There was no reason to use the weapon without both. There was every reason to use both. The only exception to this rule is that the scope would not be used for close quarter shooting. But there was no reason for any close quarter shooting except the murders.
The fact Jeremy removed the scope is very damning because the only reason he would remove it would be in anticipation of the murders. But even worse he lied saying the weapon could not fit int he closet with the scope and moderator attached. AP refuted this lie and police checked and found AP to be accurate. Jeremy then changed his story and claimed it could not fit in its case with them attached and that they put it in its case. This was an even bigger lie- Nevill didn't by any hard plastic case for it like AP had for his weapon.
Why did he lie and say the weapon didn't fit unless the scope and moderator were removed? These lies were to provide a reason for the scope and moderator to be removed because there was no legitimate reason.