Didnt get a chest!

I played a game of ARAM with Lulu, and didnt get a chest. I got S, and i didnt get S with Lulu before that, so she was chest available champion for me. Im not sure if i have any punishment for bad behaviour, because i said to my teammate ''idiot'' a week ago. If that is the problem, can anyone tell me how i can check duration of my punishment, please? Sorry for grammatical misstakes!
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