Ok so I noticed running MgT over and over, I did it normal mode and the engineering recipe for health potion injector dropped from kael'thas, and it was BoP and only visible to the engineers, and then today on heroic mode, Kael'Thas dropped cat's swiftness and I saw that it was BoP and only visible to me, the enchanter.  This coming only a week or so after I paid 500g for it.  Sigh.