On November 7, 2019 the Office of the U.S. Representative (USTR) released a notice granting and additional 36 exclusions from the 301 China duties.
Prior, on October 28, 2019, the Federal Register notice (84 FR 57802) was issued notating that these exclusions would be retroactive to September 24, 2018 and extends through August 7, 2020.
CBP also issued CSMS #40564257, dated November 8th, 2019, providing guidance on filing List 3 product exclusions. Per the CSMS, the exclusions are available for any product that meets the description as set out in Annex A to Federal Register Notice 84 FR 57803, regardless of whether the importer filed an exclusion request. Further, the scope of each exclusion is governed by the scope of the Harmonized Tariff Schedule of the United States (HTSUS) 10-digit headings and product descriptions in the Annex; not by the product descriptions set out in any particular request for exclusion.
As a reminder, for refunds, post-summary correction (PSC) filings can be made by the importer directly or any licensed broker; not just party who filed the original entry.