Fix chests from S,S-,S+

I got S- and S on Amumu and still no chest.. I have 4 chests available but how can my friend that has 1/10/3 as a MID get a chest and me not?!?!?! + It says you will get chests by premade.. then why do i carry and get no chests pls? **(i have played with friend..** + **(((carried the team 21/2/12 with {{champion:245}} )**
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