I wish people would stop suggesting using the police as the yardstick of whether something is legal or not. The police are NOT legal experts, and are under no legal obligation to provide you with the relevant statutes. A letter from them (should they see fit to send you one) absolving you of guilt should you follow X rules is generally worth the paper it's printed on. It holds no legal weight, and will not save you in court should you unwittingly violate the law.
The actual, real-life laws are accessible by anyone with an internet connection and unlike the local PD, are 100% accurate. If you really feel the need to have an intermediary explain them to you, hire a lawyer or write to the state AG. They're specifically trained to deal directly with the law.
Also, the suggestion to get a pre-1899 gun for transport is poor advice, since while they may not be Federally classified as firearms on a Federal level, you'd be hard pressed to find a cop in the nation that wouldn't consider it a firearm and treat you acordingly if they found you transporting it in a manner not in accordance with their state law. You can argue that the Feds don't consider it a firearm all you want, waiting for your lawyer in the county jail.