The HK Avifauna sets out quite strong evidence (especially 15 out of 43 birds trapped in 1996-1997 showing signs of captive origins) for not treating HK populations as wild.
It is locally common in Guangdong. The first known records were at Luofu Shan, which is only 80-90 km due north of HK, in the early 1900s and Siu Hang, Shaoguan in the 1920s (type locality of the subspecies kwangtungensis). Recent records are from Ba Bao Shan (Nanling), Che Ba Ling, Dachaoding, Luokeng and Sanyue, all in the north, and Dawuling, Dinghu Shan, Nankun Shan, Gutian, Lianhua Shan, Luofu Shan and Wutong Shan, all in the south.
Wutong Shan is the big mountain on the HK-Shenzhen border, and birds recorded there could of course have originated in HK. The question for me is whether birds from Luofu Shan or a nearby site such as Gutian or Lianhua Shan could reach HK naturally.
