How does “A pack, and what complete means” work on the Audit page?

Each company's pack is up to 32 papers in the auditor's order, from 0 Index and 1 Opening balances through 3 Bank, 4 Fixed assets, the VAT, sales, pension and PAYE papers, 11 Intercompany, 12 CIS, 13 Manual journals, the aged ledgers, 17 Corporation tax, the statutory statements, 21 Directors, 22 Contract WIP, 23 Going concern, 24 Provisional accounts, 25 Related parties, 26 Leases, 27 Employees, 28 HP, 29 Policies, 30 Provisions, 31 Loans and facilities and 32 Representation enquiries. The left of a paper is figures from Xero with a reconciliation line saying what was agreed to what; the right is what only a person knows — typed comparatives, evidence, commentary, sign-off, versions. A paper is Complete only when it agrees, is itemised or within tolerance, and its sources were actually read; a signature never closes a break, and a figure the pack could not read is unknown, never nil. Which papers apply to which company is decided from the data (no CIS activity, no CIS paper) and overridden on the cog. Where: Audit (/accounts/audit-runs).