Missing Chest

Unfortunately I have no way of proving this cause I wasn't screen capturing at the time however I just opened a chest and it contained 4 items: Nautilus Champion Chard Chest Key Gemstone

The Gemstone had a Key for it's image for some reason and afterwards my inventory had no chest and key. Not sure what happened but I've been robbed of a chest and key. :/

I have since restarted the client and it is still missing.