Crafting instance have epic gear recipes. The problem is you can only get them from humanoid mobs. The instances will spawn bears or bugs and kill your chances to get a recipe. So I recommend you get out of the instance and cancel the quest. Canceling the quest and retaking it will reset the mob types.
If you choose to pick resources instead of the other rewards, you have a chance to get one in the chest.
I’m told that anything level 85 humanoid have a chance to drop the recipes.
I have seen them drop off of mobs in raids.
I can not confirm if they are in skirmish chests.
The links below show the recipes you can get from these scrolls.