I won 10 Treasure hunter keys from advent. I saved 5 for today. I logged on today and they were gone. I should have logged on today and had 9 (5 from advent, 3 from Prem mem and 1 won from skilling) but instead I only had 4 (3 from prem mem, 1 won from skilling). Did they expire or go away? I realize that they don't stack from day to day for the ones received for membership. But ones that are received for other reasons stay, am I correct? Why did they disappear? If I decide to purchase keys and i don't use them immediately, will I lose those too? What gives? Thanks for any help.