I bought it at a local online store selling electronic products. It looks no different from the picture on the official website, and there is also an anti-counterfeiting label on the box. However, some components are slightly offset, and the words on the connector are easier to rub off.
I found some content in the forum. It seems that other people's board will only be displayed as a USB serial device, so maybe I think too much.
Here is what I found:
Problem uploading to board
Problem with COM ports, please help me understand
DFU-port not working for Arduino Uno and Arduino Uno R4 minima