A constable or other person appointed by a magistrate shall, during the first thirty days of each calendar year, prepare a jury box for use in the magistrate’s court which shall be provided by the governing body of the county. Each box shall contain two compartments designated as A and B respectively. The person charged with the preparation of the box shall, within the specified period, place in Compartment A of the box the individual names of all qualified electors in the Jury Area. After Compartment A has been filled with names, the box shall be locked and kept in the magistrate’s custody.