Looks as if Box ought to be in the lower left panel as well. Who is Basilisk talking to? I think they left him out! He should be direct left from Basilisk's left shoulder.
Looks like a couple of the people in the last panel, aren't in the 2nd-last panel, even though they should be. Makes me think that 2nd-last panel has the two conversationalists only in it, because they have turned and therefore screwed up the reader's view, so Box would be just off-panel. That's my best explanation; years too late for the coveted no-prize, eh?