It is not entrapment for officers to confront someone who advertised they planned to violate the law. It is how undercover work happens.
Google "civil forfeiture".
None of us can accurately state what he might be charged with, and without knowing what charges might be filed, it is impossible to say what penalties might be imposed if he is found guilty. For now, he needs to follow his lawyer's advice and zip it. Once/if he is charged, then he needs to consult an attorney.