Are there clear signs of storm damage on the bat? Any bat I find with storm damage which is evident, I'll only sell at vastly reduced prices, as I have recently on here. The issue is partly that there's no comeback on storm damage from willow suppliers, so you do get some and have to take the hit selling it for less than cost, or be happy be selling it at full price without making it clear it has storm damage.
Every bat can be inspected I feel regardless of volume, as they're all sanded etc by hand and you can see it when finishing generally. Unless there's a hidden fault, at which point I'd replace it under warranty. Unfortunately, if out of warranty then I'm not sure they're liable regardless.
One batmaker I know said 'You don't get anything back from suppliers on storm damaged willow, so you've got to sell it. If it makes it through the warranty period it's all good. If it doesn't you'd replace it and not make a loss anyway'. Not my style though as I just don't think it's right. However, I've seen plenty of bats come through the workshop from big companies with pretty clear storm damage, so it seems it's the accepted approach by many.
In fairness, they'll still ping and some will last. But I wouldn't be happy paying full price and certainly not 450, if it's clear there is storm damage.