Well you use your real share to generate a complex series of investments to make it very hard to judge your wealth. In it you begin trading gold legitimately, not gold markets but buying and selling real gold. The stuff off the boat gets mixed in over the years. Buy some shipwreck gold! Collect gold coins personally! Buy and sell collectables

Melt some down, have it remade into other things, and it gains a bit of weight here and there.