You're assuming that the customer had the ability to wipe the drive after it failed. If it was defective then it's quite likely not to be the case.
This sounds an awful lot like someone returned the drive either mistakenly thinking it was defective, or after hitting some sort of intermittent failure with it. NewEgg (or the HD vendor) then "tested" it and stuck it back on the shelf without wiping it. Or maybe they replaced some of the solid-state components and called it a day.
Either way, I'd be very suspicious about putting my data on it. It certainly wasn't tested well after being "fixed" at the very least.