The wording of the box game is totally flawed..
"You can only OPEN one box per hour".
Better luck next time means the box didn't open.. therefore you should get to keep going until one "OPENS"..
Or else re-word it to you can only attempt to open one box per hour.
Apart from that I play if I remember, I have opened loads of them and I have 3 gems, every other try has been a better luck next time..
check the leader board and guy at the top has over 1,000 odd... pointless to say the least.
Have to add I used to play with cash opens, now I just use free.. if I get one fine if not no biggie.
I am a free player so never use any gold at all.