The article draws attention to specifics and difficulties I encountered when describing and arranging the fonds Public Prosecutor’s Office in Ptuj 1945–2000. With the help of found instructions and rules for the functioning of the prosecution, I tried to bring the public closer to office operations of public or state prosecution in Ptuj and to the material of the aforementioned fonds. My intention was also to present, through instructions found in the material of Ptuj Public Prosecutor’s Office 1945-2000 and State Prosecutor’s Office 1944- 1999, the evolution of naming different registers in the years between 1945 and 2000 and the importance of their content for entering the cases at which I only partially succeeded. Several matters remain to be solved, especially those which were the reason I started writing this contribution, for example, content interpretation of registers O, U, E, KTS, and KTPZ for maintaining of which I was not able to find appropriate instructions. All findings are mere assumptions of inductive and deductive reasoning partially assisted by former employees at public prosecutions in Ptuj and my colleagues from other archives in the field of justice administration. Hopefully, my colleagues will find the answers to those questions in the future and will either confirm or refute my assumptions, thus helping to expand the table made during my research which is intended as a tool to help the archivists responsible for judiciary’s material in their work. The table shows which registers were kept by the Public Prosecutor’s Office in Ptuj through various periods of time and which matters were recorded in individual registers according to the rules or which matters are actually recorded there. The primary purpose of this contribution which aims to bring the fonds of the public prosecution closer to the general public and present it as an extremely interesting and useful source of material in various scientific disciplines was achieved. Its usefulness, however, will only be proven in the future when the material containing mainly sensitive personal data becomes completely publicly available.