[CLIENT] Missing Level 6 Mastery Token.

I played a 42 minute long game with Darius on July 17 between 4:30 to 5:20 (these are the most accurate times I can give).

This is the Game I played in: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2243710712/31777548

In the post-lobby of the game, I received an S- and became Mastery 5 Darius along with a message displaying that I have also received a Mastery 6 Darius Token. However, when I went to check my "Loot and crafting inventory", my Mastery 6 Darius Token wasn't there. I'm unsure as to why that is.

If you need more information, I can provide it to the best of my ability. Thank you in advance.