Atlantic City’s Revel Casino Hotel warned its staff yesterday that it will shut down this summer if a buyer can’t be found in bankruptcy court, the Asbury (N.J.) Park Press reported today. Revel said that it is seeking a buyer for the struggling $2.4 billion casino, but can’t guarantee one will be found. If not, employees could be terminated as soon as Aug. 18, Revel said in the letter. The company also said that it plans to stay open while it searches for a buyer, operating as usual, honoring player comps and paying employees and vendors. Shortly after distributing the letters, Revel filed a chapter 11 petition with the federal bankruptcy court, its second in as many years. The casino said that it hopes to find a buyer quickly.