So to summarize:
In the Northern Hemisphere
Touches the Atlantic Ocean
Surrounds at least one island under the control of a European country
Does not border Europe
Does not border South America (i.e., not the Caribbean Sea)
Not the Labrador Sea or the Greenland Sea
Is it the Sargasso Sea? I...
Actually, the only thing that wasn't stolen at the Louvre's Apollo Gallery is the Regent Diamond, figure no one would take it because something to do with a curse.