Missing Old Vault Key

[Doctor Hide.6345]

     So, I am trying to get some mastery points done, so I can finish my Arborstone. I can't seem to find the old vault key though on any of my characters. I did a gw2efficincy check as well for it. When I go to the spot, the chest that contains the key is also not there. Is something I have to contact support about, or am I missing something here which the wiki is not mentioning  for it to show up?

Edit: After restarting game, it finally opened for me. I guess I already opened it before just don't remember. Just didn't open for me at that time for whatever reason. /shrug 

Edited May 26 by Doctor Hide.6345