Presumably there must have been some ducal dust on the ‘attic’ items from Chatsworth, certainly on those bits and pieces salvaged from Devonshire House, demolished nearly 90 years ago and gathering, well, you know. With the sale now history and with a sale total of nearly £6,500,000, it will be interesting to see what further spruce up Chatsworth might experience.
Also of interest will be the unfolding deployment of items purchased at the sale. The trade was in evidence, but in the information age, nothing is secret, so it will be a particular feat to see how a dealer could make a purchase as prominent as at the Chatsworth sale, mark it up and then offer it for sale. 
There was a time when country house sales were six in a weekend and goods were cheap, a dealer could buy an extraordinary item or ten, salt them away for as long as a decade, and then bring them out, fresh, as it were, to the market. No one in the trade, I’m afraid, has that long a purse any longer, and items are almost invariably offered as soon as they are shop ready. That said, the Chatsworth sale commanded extraordinary prices and one can only conclude much of it was driven by retail punters, making if not a once in a lifetime, then a once in a decade purchase.