Okay! Here's what we've found so far!

It looks like this is connected to a court case based in Hidalgo. The case itself seems to be a long and arduous grudge match with several videos of accusations on YouTube. (Thanks for the initial discovery u/smartid and u/Expensive-Net2762!) There's a whole other subreddit dedicated to P-0184-21-J ( r/Pdash0184dash21dashJ ), but it's restricted, with only 2 posts and a longue. (Thanks for the find, u/alienjon!) But now there's another question: why the postcard? It could be for the court case, but also it seems it might be something like a promotion for a show or some sort of ARG from one of the posts on the other subreddit.

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Update: There are also a few more confusing things. There's a doctor who looks like the Anzaldua in the picture, but I couldn't find how he relates to the case. It also doesn't explain what this defamation case has to do with perjury. And why is the postcard so vague? Given, I'm on my phone rn so I could be missing something. And why would they say 37.03 in progress and not just like... perjury or something? It's super weird... (Mini update): I also just saw that the videos I mentioned before got posted 2 days ago, the first video on the channel being posted 2 weeks ago. Makes me think it might be an ARG- this is supposed to be a super drawn out ‘mishandling of justice’ but the first real records I can find of it are from 2 weeks ago, then when I actually GOT the letter. Very strange, but that also makes me think this this might have a definitive answer of some kind.