LoL accounts in Riot folder.
Basically I made two accounts a long time ago and I was wondering where you find the full list of Riot usernames that have accessed your computer. I know it's somewhere in the Riot folder.
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Riot Games/League of Legends/Logs/Game - R3d Logs
Search some of those files for the phrase "summonername", and on that line it'll say what the summoner name for ever player in that match was. You should be able to recognize it from there.