Section 164(a) in The Mizoram Autonomous District Council (Constitution and Conduct of Business of the District Councils) Rules, 1974
(a)All the ballot boxes allotted to a particular candidate shall be separated from those allotted to any other candidate and numbered and placed together, and the counting of all the ballot papers contained in the boxes allotted to the same candidate shall be completed before the counting of the ballot papers contained in the boxes allotted to any other candidate is commenced. The Returning Officer or a person authorised by him shall distribute ballot papers in convenient bundles to the persons appointed to assist in the counting of votes.