What documents do I need to return to Nanchong from Chengdu on September 22, 2022?

On September 22, 2022, I returned to Nanchong from Chengdu, and I needed a negative nucleic acid test certificate within 24 hours. Relevant data show that as of June 8, 2022, 10, Nanchong government published an article announcing that foreign personnel returning to Nanchong need to hold negative nucleic acid test certificate and health code screenshot within 24 hours.