Guild Wars 2

So… I just got the fallen Masks silver chest but i can’t add it to my collection. What gives? It’s not giving showing in my Dark Harvest collection list that I earned it even though it’s in my inventory.
Anyone got ideas on what’s wrong?

You have to open it.

Mallis.4295:

You have to open it.

Thank you. I wasn’t sure and didn’t wanna risk having to do that stupid adventure again if Opening it screwed me over.