I don't want to be disrespectful, but the pricing seems to be over the top. From what I have seen in the past, these sets were frequently sold for prices well below $3k, most times even below $1k, see the below links. Is there a link to the auction in which one of these sets sold for $12k? I would very much like to see that!
https://www.invaluable.com/auction-lot/igor-faberge-imperial-chess-set-in-box-5316-c-ce94cf7bc7
https://www.invaluable.com/auction-lot/franklin-mint-the-faberge-chess-set-1294-c-08ad8ca86e
https://www.lelandlittle.com/items/162377/the-faberge-imperial-chess-set/
https://www.liveauctioneers.com/item/58520747_igor-faberge-imperial-chess-set-in-box
Accepting Reasonable Offers
Faberge Imperial Chess Set - 24KT over Solid Silver with Inlaid Rubies, Emeralds, Sapphires, Cultured Pearls, Amethytets, Tourmalines, Aquamarines, Citrines, garnets, and Jade.
Box is made of solid Rosewood.
442/1500 Sets worldwide
Appraised at $6,000. One sold at auction for $12,000 in April 2021.