Ok I just completed OA first time ever, not bad I did enjoy it, only thing is I was missing an intel suitcase which was highly annoying.
Considering I looked VERY hard not to miss anything, even starting over at one point to make sure I hadn't left anything I still managed to miss one.
Is there one that is real hidden or something, because they even make a noise so I can't see how I missed it. Thanks.

There are 4 in The Guns of Anchorage, the first operation, 4 in Paving the Way ( 1 each at the Mining Town, the Listening Post, the Ice Camp and the Chimera Depot), and 2 in Operation: Anchorage, which is the final task.

For a long, long time, all I could get was 9. So for a while, I told myself I didn't care, but really, I did. The one I always missed out on was when you are inside, going through the halls. Some of the walls are so shadowed that they hide the fact that there is a door right in front of my face. So yeah, when I discovered the door, right there, where I had passed by a million times....

That would be the door on the left with the "Holotape-Invasion" and a stealthboy, right?

Yeah. Ugh. I'm fuming just thinking about it.

So is it worth redoing? I know you get a perk, no idea what it does though.
I'm happy anyway as I had heard people talk highly about the Chinese stealth suit and now I have it I see why. I love it and the shock sword.

Big D it makes it more annoying for me as I kept checking the local map to make sure I didn't miss any... It must be in such an obvious place that I didn't check the local map for that area..

Oh and what about leaving that place? There was like 20 super mutants to kill and an overlord! WTH? He killed me like 6 times. The outcasts kept turning on me as they kept running in front of me when I was in vats.

Strangely enough, that was the only suitcase I found the first time when I played through the DLC.