I would sell it because the two in the Item Market are going for $2.7b and $3b respectively. Maybe try selling it via trade with a trustworthy buyer that won’t buy-mug you; simply selling it in the Item Market is too risky, imo. You could also try auctioning it off in the Auction House.
Do you have networth merits? If not, keep it until you get them.
Afterwards, speak to some trusted traders and see what sort of price they will offer for it, it's not an easy item to move because it's just a collectable but you should hope to gain about 1.8 - 2.5b on it dependent on the market shift if you wait a while. Hosp yourself before the trade and then use a ghost trade before you exit the hosp.
As someone else mentioned, you may wish to hold onto it until obtaining certain networth merits if you don’t have them already.
Beyond that, you could attempt to sell it to a trusted trader (someone who won’t buy / mug you). But another option is to auction it. I hen you auction an item there is a chance it may not sell for your desired price. But once it sells you’ll be issued a check that is held in the bank.
You can than collect that check sometime after it sells when you know you have a plan for what to do with the money. If nothing else you could immediately place it in the bank and earn interest on it as you decide what you may wish to do with things later. and this would keep the money safe for yourself.