Since the document seems to have been intended as a complete collection of Ockeghem's music, these movements were probably left out because they were either unavailable either to the copyist or not in a legible condition. Blank opening sections in the codex also imply that at least one other movement, probably a three-voice setting of the Communion in a more sedate style recalling the opening Introit, was originally intended to close the work.
The document is intended as an exhaustive collection of Ockeghem's music. These movements were probably left out because they were either unavailable or not legible. Blank sections at the start of the codex suggest that another movement, possibly a three-voice setting of the Communion in a more subdued style reminiscent of the opening Introit, was originally intended to conclude the work.