Zero powered on hours doesn’t necessarily mean it’s new. The SMART data is usually reset on refurbished drives - and I guess it could be done even if the drive wasn’t refurbished. Similarly, a surface scan won’t tell you that the drive is reliable. Only time - or the manufacturer and retailer’s reputation - can reassure you about this.
My view is that hard drives are so cheap, and you buy them so infrequently, that there is no point in saving a few pennies by buying from an unknown source. WD will sell you drives directly for a very reasonable price.
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Obsession is the single most wasteful human activity
Norman Mailer