It is sad but true: the police are not your friends. The BATFE are not your friends. They are not necessarily your enemy nor are they necessarily to be scorned, but they are not your friends. They NEVER come knocking at your door wanting to see your guns, home, stuff because they are just friendly. Virtually nothing good can come of chatting them up and cooperating with them as they work in an official capacity. Mayberry was a TV show. I respect them and the job that they do, but I also realize that they are permitted to lie, to deceive, and to intimidate in the course of that job. And if, in the course of that job, they have reason to fix their attention on you, no amount of chattiness, friendliness, or cooperation is going to help your case, but it could darned well hurt you.