I dont know if you would count these as clues or not, but I have come to the fact that everything Chelsea posts is important somehow. OK here goes:

>Marci sent it to Athanasius as soon as it came into his possession.

Athanasius was a Catholic Saint.
More info here --> http://www.newadvent.org/cathen/02035a.htm

>What was it? A manual for euthanasia? A chart of the cosmos? An introduction to another world?

I believe this sentence has to do with the next one.

>No one knew, and still, no one knows. Perhaps, in asking Beinecke, some light will one day be shed on its mysteries.

Beinecke is the name of a library at Yale. The reason why I think this has to do with the sentence above is that a library has manuals, chats, and "introduction" books to things.

This is just my thinking. I dont know if it helps any.