Neither does anyone else: "In order to preserve operational effectiveness, the U.S. Postal Inspection Service does not discuss its protocols, investigative methods, or tools," and "In sum, not much is known about iCOP" - https://www.snopes.com/articles/393823/usps-icop/

One of the first articles that brought this up: https://news.yahoo.com/the-postal-service-is-running-a-runni...

See also: https://www.vox.com/policy-and-politics/2020/8/20/21377305/p...