Today i earned my daily chest but was still at bronze II.
I didn't want to open it yet because i planned on making it to silver III. Which i did!
Then once I was Silver III, i went to open my chest and saw this
I was bummed because I had hoped I would earn 2 chests... but then once i went to actually open them, i saw this
Lesson learned. If you plan on making it to the next league, DON'T OPEN YOUR CHEST until you are into that league