Beginner champions shards missions

So when you first create an account, you get to choose to have one champion shard out of five ( Daruis , Yi , Ahri , Miss fortune , Lux ) and the game tell you not to worry and that you will get to have the remaining shards in the future, which does end up happening as you eventually get missions that reward with those shards now my question is when does that happen ? I've made multiple accounts and to me it seems like you get those shards out of nowhere, no certain level or anything . some of my accounts never got those missions to begin with .
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