If you have CS4 still installed on your machine you could make a right click on the folder with your scripts in the scripting panel und choose "show in finder/explorer". This brings you to the CS4 folder with the scripts in it.
Also, there are two possible script folders, in the panel they show as User and Application.
The User folder is in new versions:
user/Library/Preferences/Adobe InDesign/Version/en_US/Scripts/Scripts Panel
The Application folder is
/Applications/Adobe InDesign/Scripts/Scripts Panel