Perhaps this has been asked before, but just wondering again. I am aware for every new product, Apple keeps some sets to be used as "Replacement Sets". Meaning they are new but just without the Accessories. These sets are to be used for those who replaced their sets during the warranty period. Hence I like to believe they are as good as new? On the other hand, unlike Refurbished sets, they may contain parts from other devices etc. I understand it goes through a stringent process as well. Is my understanding correct?