Almost inexistent hextech key fragments drop

Hi awesome people! In the past month I've only got one or two hextech key framents...which is not respecting the usually drop rate as Riot said(like 16 fragments for 4 chests). Is their time over? I've read that those fragments will be earned through honor system...but he isnt even live yet... I am kinda confuse cuz i got 4 chests with no keys. All the best!
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