I received a verbal reply from AFCD Mr Yam for the above issue on 27Aug09 (Thu). Then I've requested a reply in black-and-white and received it today. A copy was cc to HKBWS for recording purpose and I post it here for your reference too.
I've got the following:
1) My residential estate management company (DBSML) DOES NOT KNOW the related legislation though they have the common sense that the bird nest should be at least inactive before it should be removed.
2) AFCD officers have advised DBSML to consult them whenever similar cases happen.
3) I think I have educated or conveyed a message to DBSML to be aware of the natural wild life in the residential area.
Cheers