Im about to transfer the reward chestsnto my wiz but i got nothing. Already sent an email just to let you know.
Experienced it too, won 24+6 chests. I assigned my rogue to receive it but didn’t receive.
Guess what? They gave me back 200 pcs chests! :)) but sadly it is RARE chests -__- so i got 4pcs epic chests instead of 200 pcs epic chests 
im so thankful
Same exact thing happened to me a few times before.
Ya just happened to 4 of my legendary chest from the arena