Mastery tokens

Hey, so I was playing some Rengar today (rank six currently). Got an S and an S+ on him but didn't get my tokens. I was really confused, and even more so when I got another S+ and then got a token. Any chance I can get my mastery 7 tokens? Feeling a little jipped. :/ It should be noted that the two I didn't get them in were in Flex Queue, but the one I did get it was in normal draft
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