Hongmoon (map) key error

[Xephirah]

When you try to use one of these keys on a weapon box from the wheel like diva it does not work. It acts like it is opening but then it gives a verbal error saying "invalid item" I also opened 100 well boxes and did not get A SINGLE wep for Warden

[RavTH]

it says on the box clearly "Does not contain Warden Sword" or something like that