No. Anything you do (short of putting some stuff in a Guild Bank) will be lost. Note that your Guild Bank will NOT be rolled back (so anything that was taken from there is NOT going to be returned to you).
You can report the name, but I’m not sure what support would do with it.
I think the Heroic box was given to everyone as part of some promotion (I got one too). It has an armor skin you may want, so you might want to update your ticket and ask support about how to make sure you get it back once your account gets rolled back.
We go out in the world and take our chances
Fate is just the weight of circumstances
That’s the way that lady luck dances