£106 eBay jug goes for £47,000

Ananova:

A ceramic jug bought on eBay for £106.72 has been sold on for £47,000.
The jug was listed incorrectly on the auction website as Italian-made, circa 1900, but it was actually a rare 18th-century Worcester Porcelain Wigornia creamboat - regarded as the 'holy grail' for collectors.
Two buyers snapped it up then contacted expert John Sandon at auctioneers Bonham's, who confirmed it was "very special".
The jug, with Chinese scenes, was tipped to fetch £20,000 in London - but went for £46,800 to two private collectors.
Mr Sandon: "The original sellers had no idea what a treasure they had."

Surely that's theft ??