Dead City in redux is a combination of Dead City 1 and 2 from the 360 version. That being the case, there is just a slight variation on the possible/presumed 'ranger stashes' laying around the mission. As others have stated, there's no way to know with 100% certainty what does and does not count, so it's best to grab EVERYTHING in the level (apart from Diary Pages anyhow) just to be safe.
I've created a full Enlightened playthrough video, and during the Dead City mission I point out - and number - every possible/presumed ranger cache, as well as directing you to the Diary Pages in the mission as well as a spot for the Manhattan Project achievement, all in order.
You can see the full mission with all items of interest and collectibles at the
21:39 mark in the video.