Crystal Chests

Is it possible to get a Crystal Chest without buying it with gold coins? You can get gold chests on wheels, gold keys from the treasure chest squares (gold and ruby) and you can get Crystal keys from the same chests (gold and ruby).

So has anyone ever gotten a Crystal Chest as reward on wheel or other chest?

Im curious because I have gotten 4 crystal keys in last week or so, and I have never seen a crystal chest other than the shops.

Based on my knowledge, It seems you can only buy them from shop. I too had crystal keys and they just stayed there in my inventory.

Where did you find the keys?

in those gold and ruby chests you land on during levels, If I get a few gold chests ill go farm miracle sea 3 for them. There is 3 golds and 1 ruby on a short level. I get a lot of seal cards, simple love potions, silver coins, but every now and then a gold key comes out. Then on rare occasions a crystal key.

I hate getting those keys it forces me to waste 8 coins..... And I end up getting something stupid like 5 seal cards