A single magpie doesn't seem appropriate any longer; this letter arrives as a pair. Once acknowledged as post, one reverts back to a fairly thick academic thesis paper and the other into a mercifully short letter from Calleo.
These two also have a fair amount of intense security around them; illusion charms to make them nearly invisible as well as specifically charmed and designed to only revert for the recipient--should anyone else try, they'll only see random adverts for shops in Diagon Alley.
Professor ( @flamboyantlycutsuit) ,
Apologies for the separate letter, I often send them when something strikes and only realise the time after it’s been sent.
I thought it would be beneficial for you to have some time to read through Questioning Discreet Verbiage: The Relationship of Metaphor and Analogy Connections between Alchemy, Transfiguration, Charms While making use of Abjuration.
It's an older work and I'm sure you've seen it before; however, this is my copy of it and it's been extensively updated, corrected, and annotated to both correct things now known to be incorrect and to add in additional notes that make working with it all significantly easier.
Interesting to note that this one has always had a high level of classification and access required to get it, which makes some type of sense once you read it or read that copy, at least.
Nobody pays any mind to what I remove from the Archives as I often work places not in my office and take work with me. The traces on any of them are tied to whichever one of my wands I used, not to the piece itself so unless I inexplicably lose that specific wand between now and the time you're done with it, they'll just think I've got it on my kitchen table.
Which is precisely where I'll leave that wand until you've finished with the paper, of course.
