Personalization marks meaning?

I know it’s kind of a bad move on my part but I’m really interested in what these personalization marks mean and if they can be traced to a person or not (Specifically two guys named Willi Muller and W Löffler.31.0 KB34.8 KB26.6 KB33.1 KB
These are photos from my previous post.
From what I’ve seen is that they’re IDs for the Soldbuch but can someone really be ID number 4?


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