[Legendary soul badge chest for FM Fire]

Can anybody pls help me what legendary soul bagde chest should i choose for my fire FM ?

[Mastery Key bundle]

U mean that there is a chance that the event my return and so does the bundle? Has that happened before? 

[Mastery Key bundle]

I had the same problem as a player who returned after a lot of years...is there any chance they will put them back on store, or are they gone for real?