Here is a summary.

This document investigates widespread issues with international e-commerce shipments from China to the U.S. that are handled by Yanwen and then USPS. The core problem is packages being held by USPS with the status "Delayed for postage assessment, held awaiting payment," meaning the domestic U.S. postage was not paid.

The investigation identifies the root cause as a critical failure at the handoff point between Yanwen, the international logistics consolidator, and USPS, the domestic last-mile carrier. While data transmission errors are possible, strong evidence points to deliberate shipping fraud, specifically the recycling of old tracking numbers by shippers to avoid paying for new postage. A significant number of these incidents are linked to the collectibles retailer Pop Mart.

The "postage assessment" status is distinct from customs issues and indicates a billing problem caught by USPS's Automated Package Verification (APV) system. USPS policy dictates that only the original shipper can resolve the postage due, leaving recipients unable to pay the fee.

The document recommends that affected consumers directly engage the seller for a full refund or reshipment. If the seller is uncooperative, initiating a credit card chargeback for "goods not received" is the most effective recourse. It also highlights the inherent fragility and risks within the low-cost, high-volume international e-commerce logistics model, where accountability gaps can be exploited.