Treasure Chest Level Maxed Out!

The level of the treasure chests you can open in the shop (there are 3 types of chests, and the higher the rank, the more coins, card rarity & quantity, and chest level experience you get) is maxed out!!! How long has it been since I started playing… maybe 1 or 2 years by feel? It's been a really long time... Come to think of it, these treasure chests feel similar to Playio's Heart Treasure Chests. They're only similar in that there are 3 ranks, but somehow...