Math Time for anyone wondering
Subject to change if they do confirm the shards (as ill be referring to them) drop once you unlock the first one
109ec per box, 400 shard minimum
Tier 1 400
Tier 2 550
Tier 3 700
Tier 4 800
2450 total to complete to the 4th tier avi BUT you dont keep the others
To get Tier 1-3 you would need a total of 3000 more shards.
So to get all 4 avatars its 5450 shards, at minimum drop that's going to be 14 boxes or 1526 ec total