It would appear that Abberline wasn't sufficiently savvy to work out for himself the 'arm through the window' trick.
Abberline [inquest testimony]—
"Barnett informs me that it [the key] has been missing some time, and since it has been lost they have put their hand through the broken window, and moved back the catch. It is quite easy."
Abberline [inquest testimony]—
"Barnett informs me that it [the key] has been missing some time, and since it has been lost they have put their hand through the broken window, and moved back the catch. It is quite easy."
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