It seems that the items you get with the event currency MUST be acquired from Shaxx, since I got the Exotic Sparrow from a Crimson Engram and it didn't count to the Triumph related with getting all the items from the event, so it would be better to set it straight so people won't confuse the stuff.
There are two different exotic sparrows from the Crimson Days. One is Undefeated from Crimson engrams, the other is Undeterred originally dropped from Doubles Matches and now bought from Shaxx. Undefeated from Tess. Undeterred from Shaxx.