In Maxima 5.25.1,
? box
gives documentation on the plot option 'box', not the Maxima function 'box',
which you have to enter as
? box <1>
which obviously no one is going to do.
You can find the function box using
?? box
but that doesn't seem right, since the name of the thing really is 'box'.
I would suggest that ? xxx display documentation for *ALL* things named xxx,
not just the first thing.
-s