Here is von Scherling's description:
|[Click image to enlarge]|
We now know that there were 210 leaves, of which the last five were "an alphabetical index", and the first had a "large initial I in red, white and black": the incipit was "Iocunda psalterio et cithara ...".
von Scherling was unable to identify the author or text. They remained unknown at least as recently as the publication of Scott Gwara's Otto Ege's Manuscripts (2013), but at some point since then, someone (can any reader tell me who?) has identified the text as Philip the Chancellor's Sermons on the Psalms (e.g. here, at the University of Iowa, of which an image appears at the top of this post).
von Scherling's inability to identify the text is easy to understand: the text does not usually begin at "Iocunda psalterio et cithara ...", so it is perhaps missing one or more leaves at the beginning; in any case, it would not have been possible for him to identify the text based on this incipit.
A leaf of the manuscript sold in December 2017 "most probably dates to within the author's lifetime" (he died in 1236), and an even earlier date is proposed: "c. 1200". This seems highly unlikely to me: the writing is 'below top line' throughout, which does not become common before the 1230s, and some leaves have full-width horizontal rulings in the middle of the page, as well as at the top and bottom, which is uncommon before the mid-13th century. Both of these features are clearly visible, for example, in the leaf at Kent State University (click to enlarge the image):
Quite apart from the ruling and layout, and based only on the script, I suspect that von Scherling's dating to "about 1270" is probably right.
For a much larger version of the image above, and about a dozen others, see the Denison University Ege website.