Some of the photos are marked, it was just hard to see them. The one you have shown is the pre-war/wartime photo paper branded as Leonar. The postcard is also marked but I cannot read it without the image being expandable. The press photo is also printed on pre-war/wartime Agfa-Brovira gloss stock photo paper.
Here are all similar nature press photo markings that I could find for photographs taken by SS KB men. They are all stamped, with some being formatted for pencil entries.
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