Mystery Chests miscounting items available?
According to the text, mystery chests will unlock a skin worth at least 975, but only if there are 10 items in the pool.
But if you have exactly 10 items available, it won't work any more. You can see that there are 10 skins that should be eligible due to costing 975+: Cottontail Fizz (975), Dreadknight Garen (975), Ice Drake Shyvanna (975), Ionia Master Yi (975), Panda Teemo (975), Runeguard Volibear (975), Scarlet Hammer Poppy (975), Volcanic Wukong (975), El Tigre Braum (1350) & Sad Robot Amumu (1350).
On a side note, while I understand this restriction when one has only a few champions, does it really make sense any longer once someone has them all?