Also keep in mind, police, judge, agencies WILL never threat you with warrants over phone, E mail, text, etc they are not allowed to do so without being in present with the offender. If you have a warrant, the marshal will be at your doorstep, not over phone. This is how you can identify scammers.
Now, you see... Why do you think cops won't call you and threat you with arrest warrant? They KNOW that if they do that, the chance of flight risk of an offender increases (Offenders usually will attempt to escape if they get hint), that is why they won't call you.
My advice.... don't response these kinds of E mail, why? Because there is possiblity a coding embedded in their E mail correspondence and if you respond, it can trigger the code which might include virus, malware, keylogger, etc in attempt to get your personal information and steal from you. Don't respond E mail at all cost, go other way around is best, like check up phone book for that company phone number and use that to call them to verify. If they said no, we didn't send you anything.... Scammer lost the game right there.