an English translation, by Anthony Alcock, of the Coptic text of Epistula Apostolorum can be downloaded.
This text contains numerous allusions to Scripture-passages.
Look through it all carefully -- not just the part near the beginning that presents some narrative about Jesus' post-resurrection appearances, but also the later part, where Jesus repeatedly commands the disciples to preach. Does anyone think that its author had not read Mark 16:9-20?
Yours in Christ,
James Snapp, Jr.