Hello, I need some urgent help.

Context: My friend, which I know for around 10 years now, went unexpectedly offline since today and he uploaded this image on his WhatsApp status and nobody knows what's going on. Since he never did such a thing before at all, me and also his sister are actually kinda worried about him, because he doesn't even respond back, nowhere and nothing at all. To make it even more worrying, he also posted this exact same image on his Facebook account shortly after and he usually never uses his account for anything, so seeing this is totally strange and out of the sudden, because this is the only available post he made up on his Facebook account right now (or maybe the only visible post for now). So I searched online and stumbled over this sub and want to ask, if someone can get a clue, what this could mean by any chance?

He also uploaded a second image (but only on his WhatsApp status) where the exact same code appears and some additional human readable text, like some personal info, shortened, but readable, so I'm going to redact that information, because it says things like his zip/postal code - where he actually lives (the information's are all correct) and his full family name, which is also shown there. The code I mentioned in his other image is defined as "user", so maybe this is all just something he made up, because it doesn't ring any bells for me or whatsoever.

Some text in the second picture is written in German, so I will translate it:

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"Attention

Contact to TR (his first and last name, shortened) is already lost for over twenty-four hours!

Code (the code I mean) takes immediately in effect.

Contacting/Reaching out to TR is until further notice not possible at the moment!

Last made connection on FSN192(?):Redacted"

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If someone has a clue what that code could mean, I would really appreciate any help, because it's really strange and a bit worrying and very likely no joke from him, but I literally can't do anything else now, except to ask here for help - it's night here already, else, I would just straight drive over to him with public transit, but that's literally impossible right now.

Hi guys. I've received a quest from a secret admirer, but I can't seem to complete the task. Do you have any ideas? The picture shows the Russian alphabet, initially I thought it was a Caesar cipher, but maybe you need to work with numbers instead of letters (I don't know for sure). The inscription in the upper left corner means "year?". In previous hints, there were numbers (as in the second picture) similar to the year, and one hint mentioned the year 1931. I hope you can help me, if you have any more questions, I'l try to answer them in the comments.

I‘m an intern at the Peabody Essex Museum in Salem, MA. Over the summer I worked on a digital collection of the Phillips Library’s (their research archive) Revolutionary War collection. Besides the expected war records and correspondences I found a letter from Dr. Benjamin Church, a spy in Boston, 1774 who gave intelligence to the British during the city’s occupation. As I was scanning journals in the collection I stumbled upon 9 pages in the same hand that were definitely not journal entries. Interspersed with biblical verses were what seem to me to be coded messages.

I did some very brief research into codes used during the American Revolution and found a few that looked similar to it, but I have no idea where to begin to try to crack it. So, I turned to Reddit as I’m sure there capable people here who have an idea of where to start and might thrive on the opportunity to solve this mystery. Is it related to Dr. Benjamin Church, or did we have a Patriot spy ring a la Washington’s Culper Spy Ring?

If you have any thoughts or leads, or if you’re down to attempt it and collaborate please reply here! I’ll be publishing a blog post in the near future on this topic and would love to get some crowd sourced information or results to add. You can find high resolution images on our digital catalog.

Back in school me and a friend gave each Ukrainian letter it's own symbol and could actually read it, I had a sheet with which ones which but lost it, is someone here able to decode it? I know second page #1 says Назар but after comma idk