If you get your relief set on the B string, does it buzz on the G? If it plays fine then don't worry about it. If you have fret buzz on one side of the neck then its time to return it or have it repaired.
Its probably a nice enough bass to spend the money to have the board leveled and have it refretted, if you bought it from someone who will not let you return it.
S.U.B. Club # 29
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Texas Bassist Club # 164