I just opened another chest and got purple dice, but they still aren't showing up.
I have the same issue. I opened 20 chests last night and I received several dice colors (off the top of my head... blue steel, Moss, light green, 2 whites, rose). None of the are showing up in my vault under dice. The only color that shows up is the default blue x6. I've closed and restarted the app several times, but they still don't show up. The cards I unlocked with the chests are showing up in the vault just not the dice.