Rare books from Long-Champ

This is a three volume set that I purchased new. It has been on my bookshelf ever since. I have leafed through the volumes but otherwise it is unmolested. The box it comes in is made of cardboard and it has very minor dents or dings.

Sotheby's catalogues from the Duke and Duchess of Windsor Auction from September 11-19, 1997. New York: Sotheby's, 1997.
First edition soft covers with slip case. A three volume set with slip case of items auctioned from the Duke and Duchess of Windsor estate on September 11-19, 1997 (which was not held until February 1998 due to the death of Princess Diana.)
The first volume is an introduction to the sale and the Windsors. It contains multiple essays on the couple, their lineage, their life, photographs of them, and much more.
The second volume contains lots 1-1789 and includes property from the public rooms of the Windsor's former residence in Paris and historical material.
The third volume contains lots 1790-3111 of the same.
Other than a slight smear or discoloration on the binding of 1 vol. Otherwise, these have never been fully opened and as such now open as new.
I obtained them new and they have been on my bookshelf since then.
They are very heavy.