Is There a Connection Between the Coin and the Door to His Mausoleum?

He says on the reverse though is a ship just like the one on the door to his mausoleum. This is really exciting for him because it's the first confirmation of his fake childhood that he's made up for himself. He decides that he can't carry this around with him because if it's discovered on him he'll get in big trouble. But yeah, this is a super childish thing to do to hide the coin and then sing a little protection song. It's even emphasized where he says I was enough of an adult to not feel shame for this childlike act.