There are four major boxing organisations - World Boxing Association (WBA), the World Boxing Council (WBC), the International Boxing Federation (IBF) and the World Boxing Organization (WBO).
I don't know what policies the above have on routine sex testing.
Then there's the national organisations. USA Boxing is happy to allow biological men who identify as women to compete against women - and vice versa, as seen with Manuel.
The International Boxing Association (IBA) of course did disqualify Lin Yu-ting and Imane Khelif, though only, I believe, after complaints, so doesn't seem to have routine sex testing, but anyway is concerned with amateur boxing.