Anthony Haden-Guest says nearly 100 of his cartoons have spent the past 15 years hanging in a Hamptons mansion owned by socialite and collector Libbie Mugrabi . Now he wants them back. In a lawsuit filed this week in New York State Supreme Court, first reported by the  New York Post ,  the veteran critic, cartoonist, and fixture of New York society accused Mugrabi of refusing to return 97 original drawings that were allegedly entrusted to her for a planned exhibition that never took place. Related Articles The complaint alleges that roughly 15 years ago Haden-Guest provided the drawings to Mugrabi for a show at her Southampton home. Under the arrangement, according to the filing, the works would be framed at Mugrabi’s expense, displayed for prospective buyers, and either sold or returned. Instead, the exhibition never happened and the drawings remained hanging in the house, according to the lawsuit. “There was no contemplation whatsoever” that Mugrabi would own the drawings, the complaint states.…