There are a variety of adaptations filtering through on the boxes around these lines.. mostly to deter kea.
The metal plate under the screw is to stop the kea digging them out. (Some particularly prone boxes they now use two screws)
Likewise the solid grilles and even the side entry, after evidence was found of a couple of cases of kea using sticks to trigger the traps before attempting to open the top.
Bonus super-long stoat.
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