This is actually a question I have always had in the back of my head about boxers. I remember when Lacy fought Calzaghe and he had some bright white straight out of the box looking new shoes. I thought....do boxers wear brand new shoes? I wouldn't think it would be the smartest idea. I would tend to think you would rather have a worn in shoe. I'm thinking that Team Cotto had Cotto test them out before wearing them in the most important fight of his entire career.
I always break mine in before I fight and get comfortable in them. I don't want them too tight and being uncomfortable or giving me blisters during a match.