I've never had to on a motorized bike.
Box turns are made by bicycles from the bike lane when the left turn arrow is green.
If I'm on my M/B I'll be in the left turn lane turning left with the light.
If I'm in the left turn lane by myself and the light won't turn green for me I'll be going straight when it's safe and that light changes green. So yeah, I don't make Box turns. Because I don't ride my M/B like a bicycle.
If there isn't a car in the left turn lane to activate the lights I'll be going straight then turning around.