Well, I'm disappointed, I was thinking of a different Acts of Pilate, which with the Report of Pilate and Letters of Pilate are all from early church, maybe 4th or 5th century.

I should've been more suspicious based on the Table of Contents having excessive specificity, but I slogged through Rev. William Mahan's Archko Volume and its turgid, repetitive, circuitous prose to the point of falling asleep, making it to page 38 before giving up on his introduction and looking for alternate sources.

Sure enough, the Cumberland Presbyterians suspended Mahan from the ministry for one year in 1885 because he had literally plagiarized Ben-Hur, as Lew Wallace himself testified to them. Mahan then just had the work republished without the offending chapter, unrepentant. Mahan's initial document, an Acts of Pilate, was later found to be plagiarized from "Ponce Pilate a Vienne" by Joseph Mery in Revue de Paris 1837. So it's pretty clear the whole thing was invented for its sales power.

Mahan invents references that would make a hallucinating AI blush. At one point he omits an entire print line from Wallace, supplying the word "anuman" where Wallace had hyphenated Anubis and Ahriman on two consecutive lines. (Wikipedia says this fact is in Edgar Goodspeed, Modern Apocrypha, Boston, 1956, p. 52, but it's actually on pp. 36-37 of that edition.) Mahan describes five different people who allegedly helped him locate and translate the documents, but none were found to exist (as Goodspeed evidences), and his professed itineraries and correspondences did not accord with reality. His plagiarism was held in exceptionally low esteem by all that Goodspeed interviewed.

Sorry to be so negative about it. Peppering others' manuscripts and one's own fantasies with invented words and names and practices that do not and cannot exist in reality does not advance the cause of truth. Goodspeed reports, still p. 37, that Mahan defended himself as follows, indicating that his entire philosophy and approach speaks for itself:

"You are bound to admit that the items in the book cant do any harm even if it were faulce, but will cause many to read and reflect that otherwise would not. So the balance of good is in its favor."