The Walker spy-ring anecdote contrasts the paperwork produced by an import-export cover business with the weaker independent records of small cash transactions. Imports and exports create documents that can be compared with a business's claimed income. Missing transactions would leave that explanation of wealth vulnerable to scrutiny. High-value payments can also create a chain of questions through tax declarations about where the money originated. Checking many small retail payments may instead require sustained observation of the business. Computerized takeaway delivery and payment systems make receipts traceable that previously passed through cash transactions.
Notable Point · 37:36-40:37
Espionage income and the paper trail of cover businesses
Import-export paperwork can expose espionage income that a cover business cannot explain, while small cash receipts leave fewer independent records.