If it's worth saying, but not worth its own post, then it goes here.
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Language is a many-splendored thing. Even a simple shopping list contains more information than a mere list of goods; a full letter is exponentially more valuable. As one fictional character once put it, it's worth looking for the "underneath the underneath"; as another one put it, it's possible to deduce much of modern civilization from a cigarette butt. If you need a specific reason to pay attention to such a letter spelled out for you, then it could be looked at for clues as to how likely the reanimated fellow would need to spend time in an asylum before being deemed competent to handle his own affairs and released into modern society, or if it's safe to plan on just letting him crash on my couch for a few days.
And that's without even touching the minor detail that, if a Faerie Queen is running around, then the Devil may not be far behind her, and the resurrectee's concerns may, in fact, be completely justified. :)
PS: I like this scenario on multiple levels. Is there any chance I could convince you to submit it to /r/WritingPrompts, or otherwise do more with it on a fictional level? ;)
It looks like you've changed the subject a bit -- from whether the letter should be taken seriously in the sense of doing what it requests, to whether it should be taken seriously in the sense of reading it carefully.