Palais Royal small upright piano sewing box

It has been an interesting month so far. A very high price of £23,750 plus premium, was paid for a Palais Royal small upright piano sewing box  or neccessaire with a musical movement, from the early 19th century.  The piano was made in silver with gold and enamel work. I am trying to find out more details from Sotheby’s because the tools inside were not, in my opinion, the correct ones. It is possible the very high price was caused by the musical movement being by a very special maker? If the price is not based on the musical movement it is hard to understand why it fetched so much with an unimpressive set of fitments.