Extra keys

[Konabeartay]

I have accumulated over 100 keys from not using them earlier on. How to I use them now? I can't find anywhere where I can open extra cases except for the keys I get during a game? Help! Driving me nuts.

[ExcalS8]

Hi Konabeartay! Keys can only be used through opening Mystery Chests obtained during a Bingo game. There is no other way to spend them.