I just followed the stupid guide (because I wanted TOM), it took about 45 mins to get all the hidden ones in patrol and missions, the one ones that sucked where the agnornoagfjsdifjorqaosajhofajso rune (spelling might be off) and weekly court of Oryx. The y1 chests where easy as shit and I accidentally got most of them just playing the game (before I even knew or cared that special chests existed).