I just got Jiangshi Mei out of a Loot Box.
Legendary drops must not be as low as I originally thought.
-During Events, there are actually two Loot pools. One for the original loot and one for the event loot. This makes getting Epics and Legendaries more likely as you are pulling from two different loot pools.
-Because the Event Loot pool is smaller than the Regular Loot pool, this makes it more likely to get a Event Legendary skin compared to the regular pool in general.
- A Legendary is guaranteed to drop every 25 boxes if you haven't gotten a Legendary since then, but depending on whether the Legendary is regular or Event, it won't change the guarantee rate of the other loot pool. So if you got an Event Legendary, it doesn't revert the Regular Loot Pool Legendary back to 0. And vice-versa.
-One of the hugest changes that happened a year and a half/two years ago is that duplicates are now extremely rare to get, unless you actually have all the stuff from that specific rarity, like Whites and Blues. This means that with a good amount of work, you can get a whole bunch of different Legendary skins before the event ends.