^^^^ Good point. "Warehouse deal" == Returned == Most likely opened and diddled with, if not already broken/bricked.
" ... Refurbished" == at least someone has checked to see if it will still power up.
(At least without leaving a noticeable trail of smoke in the air.) *
* I am being unfair to some of the refurbishers in the business, some actually do more than the Amazon factory does to ensure it is a good, working, device.