Ashe changed class so i cant do the challenge

Hey!

So I recently bought a Ashe Spotlight pass and I have a problem with one mission. Obviously Its mission called: Obtain an Epic or higher rarity Hop-Up from a weapon supply bin as Ash. I know its pretty common to have problems with this mission for people but they didn't know about that the have to use the red chests with additional shelf. THE PROBLEM IS THAT I KNOW ABOUT THIS RED CHESTS BUT FEW DAYS AGO THEY CHANGED ASHE FROM BEING ASSAULT CLASS TO SKIRMISHER AND I CANT OPEN THEM NOW!! Any Ideas what can i do about that. The thing that i have in mind is playing duo with assault legend and steal all loot from this shelf but it won't probably work. pls help 

[Superuser Edit: Merged thread into main thread]