The expert photographers on the forum can probably explain better than I can, but my understanding of the reason the fiducials wash out against bright backgrounds is to do with the way photographs are developed. I don't think colour changes are instantaneous in adjacent parts of a photograph; so where you have a very bright object on a photograph next to a very dark object, there's a very narrow band between them of intermediate brightness. So when the dark object itself is also very narrow, it gets caught in that narrow band of intermediate brightness and so appears lighter than it objectively should. Then, add on low resolution scans of the photos and fine details such as the unusually lightened fiducials disappear.
As for the photos themselves, I can't identify the first one except that it's obviously from one of Apollos 15, 16 or 17. The second one I think is from Apollo 12, as that was the mission where the horizontal bar of the flagpole didn't work.
If you'd like to find the exact photos, here's my preferred method. First go to the Lunar and Planetary Institute. They have moderate quality versions of every photo, individually labelled for their unique codes, and grouped by magazine. If I know which mission a photo was taken on, it rarely takes more than a couple of minutes to find the photo, and thus its unique code. Then I go to the Apollo Lunar Surface Journal and search their photo lists for that photo, as they some very high resolution scans of photos. These scans are pretty much always able to show the fiducials, regardless of background.