I wasn't going to report this but it happened a second time.Several minutes ago (4:25 EMC time) I clicked one of the hidden chests and got no item. Then when I clicked it again, it says I claimed the chest already. This happened on 'azoundria8'.Yesterday night on 'azoundria2' the same thing happened for one of the chests I clicked. I logged out and back in and verified that indeed I had no additional items in my inventory.Thus, on both these accounts I was only able to claim 9 chests. It would not let me get a 10th item.I assume this is a glitch and there isn't supposed to be a random chance to get nothing from a chest.I have additional details including which chests this happened on (and it was two separate chests). I'm not too worried about the items, but I assume this is a bug you'd want to get fixed for next /event.