I understand that Form 1s, 4s and even 5s are confidential as they are legally tax returns, but is that protection extended to the non-taxable forms like the manufacturer and dealer to dealer forms as they are not tax documents but rather supportive material of a federal license? I also find you catch more flies with honey than vinegar.
Instead of taking the opportunity to inform a LEO about Form 3s, you chose to fight it in court and waste time and money. In the end, the LEO probably learned nothing and your wallet is a little lighter. I guess the only good thing to come out of this is that you have a cool mugshot to put on a T-shirt.