Mastery Token didn't drop in a ranked game?

Hi all, I just recently finished a game of talon where I received an S- grade, without a mastery 6 token dropping. I'm currently level 5, and know that they drop on summoners rift normal and ranked game types, as well as dropping for mastery level 6 between S+ and S-. I was keen to get rank 6 haha. Here's my game: Edit: I went to screencap the picture of my grade, however i've noticed that grades aren't showing for a number of my games?
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