The Nexus Player was once Google’s reference device for Android TV, a device running pure Android TV which could be used by developers to try out their apps. In June it was discontinued and even though it did receive the update to Android 7.0 Nougat, individuals had a difficult time trying to find it. If you were lucky you could pick one up on eBay or from a friend.
This doesn’t appear to be a newer model, it’s definitely not a Nexus Player v2 or Pixel Player, but it does seem like someone found a box of them in the back of a warehouse. If you’re interested in picking one up, this may be your golden opportunity.