Every person legally convicted by verdict of a jury, of detaining from any person duly commissioned to any office or appointment, any records, books, draughts, plans, papers, seals or other documents, to such office or appointment belonging, or in any wise appertaining, after reasonable demand made, the court before whom such verdict is given, shall sentence such person to be committed in close custody, in the jail of the proper county, there to remain without bail or mainprize, until such papers so found by verdict to be in his, her or their possession, shall be delivered to the proper officer, and shall moreover pay a fine not exceeding one hundred dollars; one-half to be paid to the officer, from whom the documents were detained, and the other half to the use of the commonwealth.