You did not mention that in your first post.
Can't do much except write an mail to Gree. I wouldn't get my hopes up though. I was missing 2 Wasp Stingers for the last collection event and i am yet to receive any reply from Gree or the stinger materials. That's how Gree treat their players.
So the same answer still apply: What happenend - Happenend.
Hope they fix you'r issue though.