The sell-off was a bonanza for two Italian collectors, Ilario Tamassia and Nicolas Petsalis-Diomidis, who bought the items after Callas died in 1977 at the age of 53.
Mr Grey, who was described in court as having a "colourful background", was a former traveller who bought and sold items to make a living and often kept large amounts of cash in his house.
Many students don't realize that the purchases and payments that are made during college can directly influence the amount of items (or the quality of the items) that may be bought later in life, including cars and homes.
The figures from the States of Jersey Statistics Unit showed islanders bought 6% less in supermarkets and 5% fewer non-food items, such as clothes, furniture and books.