We added this to our private server, and only have a dozen breeding dodos and just a few other tamed dinos since we started ark 2 weeks ago.
We've not seen one box drop at all, and frankly it feels like a complete waste of time now. If we haven't seen one drop in two full days, and we have 4 players, it would take us two months to unlock the hairstyles for all 4 players, which feels pretty sad to us.
I get that people should have to play to earn these, but the rates are really intended or large established tribes with tons of breeders and tribe members.
Maybe it should have a sliding scale for smaller tribes with fewer members and breeders to give us new players at least a chance of obtaining these event goodies?
After two days of trying to obtain even one, we are pretty much just giving up on it as a non event imbalanced waste of time.