I read that, with the release, you only can get [u]one[/u] key from a chest per week. You don't have to grind for those keys; you will get one after completing PoE on 32+. People who had grind for keys get extra loot, it doesn't mean you won't get any loot if you don't grind. It's totally okay if you didn't got one. Just play the way you want; it's your game! ;)