You won't be out anything. Amazon will take returns with full refund no questions asked, and will even issue you a return label postage free. It might be a marketplace seller, but it's being fulfilled by Amazon, so no risk at all.
Well I saw that it's being fulfilled by Amazon, and my first thought was that it reduced the risk, but if you think about it, I'm not sure a $10/hr Amazon distribution center employee can spot a counterfeit. TBH, I'm not sure if I can with this particular bat, but I do have lots of others to compare it to, and will.