Was oldest gospel really found in a mummy mask?

Joel Baden is professor of Hebrew Bible at Yale University. Candida Moss is professor of New Testament and early Christianity at the University of Notre Dame. The opinions in this column belong to them.

(CNN)Media outlets have been abuzz this week with the news that the oldest fragment of a New Testament gospel -- and thus the earliest witness of Jesus' life and ministry -- had been discovered hidden inside an Egyptian mummy mask and was going to be published.

The announcement of the papyrus' discovery and impending publication was made by Craig Evans, professor of New Testament at Acadia Divinity College in Wolfville, Nova Scotia. Evans described the papyrus as a fragment of the Gospel of Mark.
He added that a combination of handwriting analysis (paleography) and carbon dating led him and his team of researchers to conclude that the fragment was written before 90 A.D. This would make it at least a decade older than other early fragments of the New Testament and, thus, an invaluable resource for biblical scholars and object of considerable interest for Christians the world over.
    The fragment, according to Evans, was discovered when an Egyptian mummy mask -- known as cartonnage -- was dismantled in a hunt for ancient documents. Mummy masks were an important part of ancient Egyptian burial practice, but only the very wealthy could afford examples made of gold.
    The majority of mummy masks were made from scraps of linen and papyrus, which were glued together into a kind of ancient papier-maché. Dismantling these masks yields a trove of ancient documents. Evans claims that in addition to Christian texts, hundreds of classical Greek texts, records of business transactions, and personal letters have been acquired. In the process, the mask itself is destroyed.
    Though it may be making headlines now, the claim that the "oldest known gospel" has been discovered is not new.
    News of the fragment first came to light in 2012 when its existence was (perhaps inadvertently) announced by Daniel Wallace, founder of the Center for the Study of New Testament Manuscripts at Dallas Theological Seminary.
    No one saw the text then, and no one has seen it now; though it has been mentioned repeatedly by a select group of people who evidently have been given access to it, its planned date of publication has been consistently pushed back, from an original plan of 2013 to 2015 and now, just this week, all the way to 2017.
    Despite the seemingly explosive quality of the news, therefore, it is important to take a step back and consider what is actually being revealed here.
    Some people are saying they have this really old and important thing, and they will show it to all the rest of us in a few years. (Essentially, this papyrus is the scholarly equivalent of "my girlfriend who lives in Canada.")
    It is unclear why anyone would start talking about a text like this, a year, indeed now at least two years, in advance. The most important established fact about this papyrus, at this point, is that it has not yet been published—which is to say, only a small handful of individuals have seen the text and are able to say anything at all about it.
    As Roberta Mazza, an ancient historian and papyrologi