My Root box is quite big, because it’s the french edition so it includes the Root automatons, and the first expansion (Lizards and Otters).
I think the smallest box i have is Complots which is a french version of Coup, with squared cards, it fits in one hand.
My biggest box is Sonic Battle Racers because I got additions from a bajillion stretch goals met on the mid-range kickstarter tier. Box Size comparison with a Mega Drive From Reddit
My smallest is probably a travel size cribbage board, if that counts.