Three independently fetched secondary reports — 'Iranian media releases the composition of Iran's negotiation delegation', 'Iranian media releases composition of Iranian negotiating delegation', and '伊朗媒体公布伊朗谈判代表团人员组成' — all align on the same core details: Iran sent a 71-member delegation for talks with the United States, led by parliament speaker Ghalibaf, including the foreign minister and central bank governor, and the U.S. delegation numbered 300. However, each of these pages attributes the information onward to Xinhua and/or Tasnim rather than serving as the original source themselves, and the provided Odaily link could not be validated. So the specific statement is well corroborated, but the evidence in this run is not directly primary.