Well to clarify when I say luck that's in regard to not getting caught, not regarding care/status of the fish just to make sure we're talking about the same thing.
But if it's not luck (keeping the fish so long with no problems), and agreed he's not hiding the fish, then how does one explain him being able to evade legal issues with this fish for so long? While yes there is corruption in the US it's nothing like SEA when it comes to such things, and most wildlife officials in particular take their jobs very seriously because they love what they do and believe in it (whether or not we agree with any particular laws).
The only other possibility is that he has a proper permit, which I think would shock most of us, as they only give them out for private care in super rare instances (and then the owner still has to spend thousands of dollars to pay for the permits).