If you have a good relationship with your pso, then go and gave a talk with him. Take the ball he copied from, and let him compare the spans himself.
As stated, it is a shame you've waited so long to address this, but if you haven't used the ball, explain that as well. Let them know why you want it checked after all this time, and explain that the discomfort it caused initially was a factor, and you just want to make sure everything is right before you start using it now.
Itsallaboutme has a point, and I had a shop do something similar once. Anything is possible, and they (pso's) are human too, so mistakes can happen. Maybe you can get it taken care of and enjoy the ball with a minimum of trouble.
Good luck.