Mozart's Portrait on a French Box of Sweets

A portrait miniature of a cherubic boy with a wig was discovered in Salzburg in 2018. It is mounted on a bonbonnière made of papier-mâché and tortoiseshell. The provenance of the box of sweets is Paris. Could this be a portrait of W. A. Mozart from Versailles? The detective trail leads to Salzburg, Munich, Paris, and Vienna. Laboratory testing authenticates the painting and the box. Stefaan Missin...