Seems the following items are missing from drop tables on random loot servers. Neither has been found after nearly a month of raids. Robe of the Spring (Item ID 1605) - Drops from Xygoz Robe of Invocation (Item ID 24627) - Drops from Xygoz
I cannot find these items on current drop tables anywhere... so they were removed from the game for some reason. I also looked specifically for Xygoz and they were not listed on any of it's treasure tables. Since they are totally gone, not simply not in the random rotation, I'm going to count this as "not a bug"