Two of my characters did not receive their fourth Restored Coffer Key this week.
I know its very easy to dismiss, as people will just think I am mistaken, but I’m very formulaic and I play 13 toons evenly. They have all done precisely 4 bountiful delves and 4 weeklies. It is clear when they are both 1 key below the rest (and yes they all picked up the renown key last week)
If its not a bug, the only thing I can think of is an account limit but I did 4 weeklies on all toons last week. I doubt anything can be done but I submitted a ticket anyway.