For a Query about 5 EPIC MYSTERY SKINS!!!

So guys I'm here, as we know, the preseason update will compensate us one epic mystery skin for every 4 rune pages bought by RP before. I got 20 rune pages so I should receive 5 EPIC MYSTERY SKINS right? Unfortunately, I didn't get anyone after I completed the mission, and I know I owned all available skins but I still think Riot should compensate those RP we paid for rune pages with something like chest that contains guaranteed skin permanent for those players have owned all skins! I'm just wondering is there anyone else met the same situation like me, we really need Riot's help~~ Following is my screenshot: [] Thank you for your time!
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