Does buying tickets at the box office avoid fees? Anyone know what that is?

No

Fee or no fee, I suggest to buy it in advance so you don't get a headache dealing with buy it there.

Sorry I can't say yes or no

This will all depend on the event provider. Most are done by Live Nation here, who state that the fees are generally not charged for in-person box office purchases. The fee does however guarantee availability and seat selection, box office is a bit of a wild card!