hunter coat legs schematic.

It's still in the game. You have to make sure you are looting Tier 2 containers. If they are Tier 3, I don't think they can drop Tier 2 schematics.

Are you save scumming? If you don't save scum, there's a decent chance you won't see every schematic that exists. That can take several playthroughs. I've done 7 playthroughs and there are still some Iier 2 schematics I've never picked up. Which is why people farm containers by save scumming. I've farmed Tier 3 containers and have all of the Tier 3 schematics (main game) as a result.

Save scumming also makes it easier to tell if a container is Tier 2 or Tier 3. You can't tell by location, Tier 3's are everywhere. Just examine the schematics that the container drops. If they are Tier 2, it's a Tier 2 chest.