I have had a hard time finding information on this as well. So despite how long ago the question was posted I am going to share the answer here to help others find this more easily. This was true for CS6, (I do not have CS4 to test) but would assume it is in a similar location.
Open finder window > click "Go" at the top of the screen
Hold down Option and click Library
Application Support > Adobe > Flash CS6 > en_US (your preferred language) > Configuration > Templates
You should then see only the folders that you have created your own templates under.