Well, i'm kinda economic, so i open my Silver cases only when i need an SR girl card to complete a "Get 1 SR" Daily Mission, and always keep my silver keys for when i'm out of Silver Cases that my friends have opened for me, or when i see that a silver case found by some of my low-level friends, or those of my friends, who frequently open my own glod and silver cases (or just a person that i fell like to help to not lose their silver case), so my silver keys amount is almost always is around 20. I don't know if it is my luck (bad luck?), just a glitch in the random pattern or something to do with the current PeroGambit, or is it even the way it should be, but i'm getting alot more of silver cases this time, rather than silver keys.