The weird case of two former Bostonians who claim they were robbed of priceless art in California took an even stranger turn last week when the pair offered up a tale about how they handled an "unknown Van Gogh." The men said they were given the painting by a Van Gogh family member and that no one outside the artist’s family knew of its existence before it was stolen. The mens' Web site asserts that the painting was “Sold!” for $1.5 million in 2004.