I messed up!!

Waaah!! I had two Level 4 chests, and I accidentally tapped and deleted the one I was going to use. While I was in shock, I opened the other one, but I think I accidentally tapped it 12 times instead of counting 11, and it disappeared... If it had been Level 5, I would have gotten a lot of diamonds, so I'm super shocked that two disappeared!!! Maybe I should only open up to 10 times for Level 4 chests... so it doesn't disappear even if I mis-tap... I should stop pushing my luck!!