I've opened/used 2 refurbs recently, both 15" rMBPs. They come in plain white boxes, but otherwise come with everything a new one would (charger, extension cord, microfiber cloth, quick start guide, Apple stickers).
Both were physically flawless, no dents dings or scratches on the cases. No problems with either as well (I exchanged the first base 2.3/8/256 after owning it for a week because I wanted the midrange model, and I've had the current one in my sig for over a month now, going great so far touch wood). And both had Samsung screens (if that means anything to you).