First pic is news view. Second is expanded view. It also looks like woman in upper left also has an SF envelope.

https://www.dimsumdaily.hk/sf-express-mailed-ballot-spotted-during-u-s-election-vote-counting-process/

6th November 2020 – (Washington) It is understood that if voters in the United States choose to mail their ballots, they must send their ballots through the United States Postal Service (USPS). Therefore, if a non-USPS mailed ballot appeared, it would attract a lot of speculation. Some netizens even joked that the Chinese are manipulating the U.S. election when a SF Express package appeared during the U.S. election vote counting process.

In response, SF Express International Customer Service said that the company’s mail can only be sent from China to the United States, and does not support receiving and sending within the United States for the time being. Some netizens explained that the votes should actually be sent by American citizens in China who could not return to the United States to vote due to factors such as the COVID-19 epidemic, so they sent their ballots back to the United States through SF Express.