I can't remember the specific forum off the top of my head. But I remember reading several long threads covering complaints about one or two specific hard drive resellers. Apparently not only were new hard drives not actually new, but the SMART data looked suspicious. So I think that SMART data may not actually be completely trustworthy.

Edit: Here's the thread: https://forums.servethehome.com/index.php?threads/goharddriv... That forum also has some in depth reviews of white label hard drives.