ok, here's my insight on it. The first time I went through, it never found it. After several posts on here, I finally figured out where they were. There is one section where you have a path that has the dead bodies everywhere. When you go through the north door, walk directly left. There is a door there. It is hard to see (I think it is partly covered in smoke). When you finally find it, go in there. I think there is some kind of chest and I think you have to battle a dual horn or two. In there, there should be a primer. I think the other one is in another hard to see door. It took me forever to find it. I am going through playing the whole game again to refresh my memory so I should be able to give a more in-depth explanation next time. sorry I wasn't more help. good luck