I would not let this slide by talking to any old person in customer service. They will probably just tell you that they are sorry and there is nothing they can do, etc. I would request to speak with a manager or supervisor. If you feel strongly enough about this you need to let them know the poor job they did in shipping your item and how it got damaged. Who knows you might just get some of your money back. You never know unless you try.

Is there any small print in MLB.com auctions that says they are not responsible for items damaged in shipping? I would check that out first though.