well if the problem is that he deleted some system files what you first need to try is system update. i have the sg4 and im not very big on phones etc but so far i havent seen any updates for it yet
so if this is the new note youre talking about this could be tricky because you may have to find a way to re install the latest (android 4.2.2 i think it is) update which means you have to bypass the phone telling you that "you are updated to the latest version" message. im sure it can be done tho
something is def wrong with the system tho... all photos etc should be in the gallery no matter what folder you save them in.... especially if there no sd card in there.