I only know about gold selling from my family, which is to go to the reputable gold shop in our local china town in Bangkok to buy/sell them. The shop also provide receipt (Which also serve as authentication paper), the gold bar will also have the logo stamp of the shop well. Though I never...
What I am curious the most is how somewhat clueless the siblings were about their own positions. They were aware that their standings weren't great but didn't realized just how bad they were. Must be deliberate choices by the royal families.
If this is the route he's going to take, not offing the princess is the right choice. If he decided to kill her and use necromancy to revive her as familiar, there is a chance that someone might find this out later.
By using deception instead, there is nothing to be detected on the princess...