Help me for add drop

Can someone help me? I need to know about the instance id to add drops, I already checked the files in the script / ai / game folder. example antcavesimplegame.cs, and the ID's informed in it that it would be, 2001 and 2002 (stage 1 and 2) did not enter the drops that I added ... could someone help me know the ID of each instance to add drops? :::::