If it was me.. I'd try and see about getting it replaced..
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Jeff

I'd return it.  There is no reason to accept an inferior quality ball when NIB.  

My equipment even used mainly in a well maintained 15 yr old center w/Bruns synthetic lanes and GS Series pinsetters show no appreciable wear after 100's of games.
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Scott

I would send the ball back, because if the ball doesn't perform the way you expect it to, you are going to think it's because of the gouge on the ball, remove all doubt, start with a ball that meets your standards. Happy holidays Pin..

The course of action I would take depends on a few things.

1. was it bought locally, or on-line?
2. If bought on-line, do you want to wait to return it and get the replacement?
3. If bought on-line, will the seller replace it?
4. If it doesn't affect performance, is looks that important? (they are to some)

  If an on-line seller shipped it to you, they will likely claim the damage happened during transit, and may try to put it off on the shipping company, which will only prolong the process. You will then POSSIBLY have to wait for the claim to be settled before anything is done.
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Good transactions list in my profile