The problem is, since he was never convicted of a crime, he could try to get the gold now, but get arrested again for the same crime and double jeopardy wouldn't apply because he was never convicted the first time around. Arguably he has a good chance of winning a lawsuit for constitutional rights violation which could pay out more than the value of the gold, now that would be ironic and maybe the root cause of his ambivalence to being locked up - he knows he's rich either way and has the finances, covert or otherwise, to back up his gargantuan legal fees. Also ironic, the gold he's hiding is now intrinsically worth at least 4 times more than when he first found it due to the recent surge in gold prices, being locked up merely guaranteed he became richer in the long run.