The Mint's generally pretty good at keeping records of official patterns and trial strikes. If the "mint had no record of it", then it likely wasn't an official pattern, and not done at the Mint, and thus not liable to government seizure, since it was never government property to begin with. Unless, of course, it's seized as a counterfeit coin (like the NORFED Liberty Dollars).
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis