I started in Gold 1 too, and I play for Champion chests.
You can recognize them by the image or if you click Details it'll tell you what was your highest league the previous season, which gives you the chest type you play for.
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Oh... now I get it... So, my reward chests are from Diamond league as I have finished there last season...
Also from this season, it's not important where you finish, but what was the highest league achieved for the type of chest you play for. It is still important however where you finish for the league you start in.