Did Bamber take the rifle out of the gun cupboard ? - Yes.
Is it not polite and normal to put something back where you found it in someone else's house ? - Yes.
With the rifle not having the silencer on, would this have made it easier to put back into the gun cupboard, or even the back into the rifle's case ? - Yes.
Were Neville and June awake and downstairs when Bamber returned from rabbit hunting and dumped the rifle ? - Yes.
Did Neville or June tell Bamber to put the rifle back into the gun cupboard ? - No.
Had Bamber just spent several minutes fetching, loading and chambering the rifle, then looking for rabbits ? - Yes.
After spending several minutes doing all that, how much extra time would it have taken to put the rifle back into the gun cupboard where he got it from ? - 10 seconds.
With it being early and Neville and June still downstairs, would they both have seen something as big as the rifle which was sprawled out near to them ? - Yes.
Were Neville or June capable of spending 10 seconds putting the rifle away - Yes.
Did Neville and June do this ? - No.
Did Bamber say Neville was quite careful with rifles inside WHF ? - Yes.
Were Sheila and two 6 year old boys staying at WHF ? - Yes.
Would Neville and June then have then been more careful than usual with rifles ? - Yes.
After Bamber, Neville and June failed to put the rifle back before going to bed, would Neville later have the chance to do this while awake with an agitated Sheila ? - Yes.
With Sheila eventually being given and taking the unexpected opportunity to take a fully loaded available rifle, is this the reason Neville phoned Bamber ? - Yes, although there were 40 reasons not to.