FUnny you create this post, i just asked a similar question regardign Antidote in my thread i created today. Everything a about the bottle, packaging indicates thats its legit, however on checkconsmetics it gives me the same message you have. I'm thinking some codes aren't registered or its updated frequently?
Thing that sucks is i'm a bit under the weather, nose is completely stuffed so i can't smell a dam thing! lol
Anyone have a bottle of antidote and can please let me now if there code comes up on this site?