What has been done cannot be undone. But during that point in time, you should call the police and don't handover your IC till the policeman come. I have encountered countless incident with NEA until I recognised some of them when I see them.
The last time, like you I left my things and that was my shopping bag. The stupid, uneducated, lazy, troublemaker, etc..etc..NEA Officers want to fine me for littering. I refuse to give in my IC instead I call the police. Until the policemen came then I hand over my IC to the policeman not to the bloody stupid NEA officer. Obviously, who wants to liter something you've bought. I was safe but it took sometime for the police to come. The stupid thing is I was let off to a crime I never commit.