Not given pack on arena

[anon43486798]

You did receive the cards and they will not have the new card indicator:

@Aelathera

Did not get Arena rewards?
When an Arena run is forced to retire due to special limited time events (like Wildfest, or the Blizzcon special arena cards), the rewards are put directly into your collection when the run is retired. The opening of the chest is a purely visual thing.