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All he saw was your T/C. When he asked if you had a license for it, your answer should have been, "All I need is a hunting license for a Thompson Contender, Sir. It's what I hunt with." You've answered his question honestly about the pistol he has seen, and, perhaps more importantly, you've not revealed that you are also otherwise armed.

I agree with the previous posters. You don't know that he was telling you the truth. Inform the proper authorities as to what happened. If nothing else, a retired GW is retired and may need to be reminded of that before he screws up a current GW's investigation.