Reward System Having Bugs

It was Tuesday 11,i started my day with teaming up with my friends....We had a premade team.So,We Started The Match And When The Match Was Over 2 Of My Friends Got A S.....So,According to new Hextech Crafting System The Whole Team Gets A Chest But I Didn't Got One!I Asked My Other Friend Too He didnt even got that!And To be clear i hadn't got An S Before With That Champion!!Looking Forward For A Reply!