How do I get those "boxes"?

What I meant on the quoted is that I see that people are claiming they got Clean Slates, Tempest, Tree Branches, etc from those boxes. They're the new boxes and I heard they're something called "Evo Box"?

I'm wondering what exactly are those boxes and how do I get them?

Sorry, I vaguely know anything about this. I just heard it's from this new patch.