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How can I test the Early Warning System (EWS) address directories in our data flows?

We've implemented both delivery point validation (DPV) and early warning system (EWS) features in our address cleansing flows. How can we execute a positive test against the EWS directories? The directories are not plain text and are updated weekly. Does the United States Postal Service (USPS) or SAP embed seed data for testing in the product files? Any other ideas?

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