You are correct in your general opinions here, EC. But just as the Export License turned an "illegal" 1933 into a "legal" one, there may be evidence not yet found that legitimizes all the other 1933's including the Langbord Ten. Even if no such evidence exists or is found, my opinion (as you may have found here) is that a "tie should go to the runner" and with no gold missing the coins should have been allowed to trade.
There is no such evidence to the contrary that "every other 1933 made it out of the mint illegally." Quite frankly, there's not much HARD evidence either way, but certainly most numismatists believe they should have been legal to trade.
And before the Export License was found, the government was running sting operations to nail coin collectors with both civil AND criminal charges. Maybe if they had spend half the time looking for the EL (found by Fenton's lawyer), they would have actually been productive.
The government in the 1940's didn't want anti-FDR "gold bugs" flipping coins for $2,500 that cost $30 only a few years before the War.