An employee or other person on his behalf entitled to preference hereunder shall file a statement under oath showing the amount due, the period during which such amount accrued and shall attach to such claim any written contract of employment and any written agreement governing the compensation of such employee, including the trust agreement under which any trustee makes claim, to the officer, person or court charged with such property, within 30 days after the creditor’s action or placing of the business in the custody of a receiver or trustee. The person or court receiving such statement shall pay the amount of such claim when allowed to the person entitled thereto.