First I want to say that @Roboartist was the first to post a Thread here on XPOff about his Official Forums' Thread in regards to Blizz keeping Invasions around as a Monthly Bonus Weekend. Please read and bump his Thread HERE, the more exposure we get the higher the chance Blizz might take...
so according to delindsay, we have 5% chance of getting TF gear from a box.
say, you are missing a a weapon to be full TF
then it is 5%/9, which is roughly 0.555%..
for a class like priest/lock/mage/rogue would be 5%/10 because you have 2 possible weapons.
with some assumptions.
1. we do not...
Check out this Level 19 Twink Mythical. If you look at his Activity Feed he has only received 37 items from Invasions, meaning he's opened at the minimum 37 Chests, but at the maximum could be even less if he got more than 1 item in a single Chest. He appears to be the very first true 10/10 "TF"...