Deleted Seasonal box because it dropped on the wrong character.

I accidentally collected the seasonal level up box on a non seasonal character, it was bound to that character so I couldn't put it in the warehouse.
So, I deleted it to free up inventory space, figured if or when I made a seasonal character, it would just drop again, right? Well, that was a terrible mistake.
So, here I am, hoping that there's anyway to retrieve it. The box wasn't in my trashcan either, so I have no idea of anything else I can do at this stage but hope there is a chance to resolve this issue.

 

Unfortunately, when the box is deleted, it cannot be retrieved again. It cannot be restored either. There is red text on the item that states this.