The manuscript forms one part of ’s (1546–1617) copybooks prepared during his time as the steward of Castle (1581–1599). The manuscript contains copies of his correspondence, royal letters, and administrative material. The writing has been done by several scribes sporadically, in all likelihood, shortly after receipt or dispatch of the letters. At some points, letters or documents are copied by single scribes. In other places, each document is begun on a new leaf, and small slips are entered between the leaves (there is also no foliation, but a few running headings, catchwords, or other aids that would help to organize the material). At least a few of the scribes also worked on Gödik Fincke’s copybook for 1597 ().

The loose leaves kept in a separate folder are dated to 1598 and 1599. There are several short fragments and notes of but a few lines. The notes are usually written in a hand of , but a longer account concerning the affairs between and is written by a later hand of . Most documents are unfoliated, but a set of copies of letters sent to by Duke Karl has been numbered in a modern hand from 206 to 213. It was probably previously kept with the copybook from 1597, which has foliation up to 205. A large part of this material consists of correspondence between Karl and Sigismund. There is at least one hand that also appears in Gödik Fincke’s copybooks, but some of the documents might stem from different sources and have only later been put together, since they stem from the same years and the same Kankas collection. Paper; 36 folios (including small slips).