"Grade A Refurbished"?

werehatrack thought this was worth mentioning said
3

Over in Woot’s bargain bin there is a listing for a video doorbell that is described as being “grade A refurbished”. Upon seeing this, my twisted mind translated that as “we haven’t really tested it, but it looks good and we don’t know that there’s anything wrong with it”. Grade b would therefore mean that they do know that there’s something wrong with it.

How would you decode it?