The Coke Delivery Ledger of Mallory Iron Works

≈ 4 min

Mallory Iron Works has submitted a foundry materials requisition to the Detroit Automotive Suppliers Audit Bureau covering raw materials received during the spring 1954 production quarter. The Bureau reimburses qualified foundry suppliers for materials used in certified auto-parts contracts, and the requisition figures feed directly into the reimbursement calculation. An internal tip suggests that at least one delivery date on the requisition has been falsified. You are asked to determine which line contains the incorrect date and which reference record reveals the contradiction.

The scene

Mallory Iron Works, a cast-iron auto-parts foundry on Livernois Avenue, Detroit, Michigan, USA, spring 1954

Source documents

Consolidated Fuel Co. — Delivery Invoice No. CF-2291
Great Lakes Minerals — Shipping Manifest No. GL-0442
Michigan Stone & Lime — Dispatch Register, Spring 1954
Superior Ore Supply — Letter to Mallory Iron Works, March 1954

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This case first aired on September 14, 2026. A fresh audit runs every morning — same rules, five minutes, one solution.

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