Welcome to Drum Chat Chrisemsd!
I don't know anything about B-stock for Yamaha in particular, but my question would be what defect is making it a B-stock? I have a guitar that is a B-stock, but the "defect" is so small it would never be noticed unless you scrutinized the guitar very carefully.
If that's the type of thing making this a B-stock, then it should be fine. I'd try to get some detail about what's making it a B-stock.
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