If Sotheby's is willing to auction it in Asia for those prices, I would
suggest doing so. For pieces of that caliber, they often have lower seller
fees and charge a buyers premium. Those are impressive pieces, but if you
expect to get ABSOLUTE top dollar, without giving up the percentage, you
need to put out a bit of real effort. You need to set up a decent web site
with pictures of the pieces, and all your documentation. I would also
engage a selling agent for a set fee of the selling price (seems like 6%
would be fair, because this is the value of a real estate deal). There are
several reputable gentleman here, or do a google and find someone in your
own neighborhood.

But since you refuse to acknowledge who you are, and you use a "free"
anonymous email service, it does smell more than a little "fishy".