The very last time we saw them was 28 Nov 2004 in On King Street park. Sometimes a small flock could be found there before sunset.
You could refer to the link:
http://www.hkbws.org.hk/cgi-bin/yabb/YaBB.pl?board=Birdingtips;action=display;num=1101654622
We saw them once only in Penfold Park but the park has been closed now.
Hope to hear some news about them too!
Carmen, Betty and Mr Or