Is “Mengchang Jun's retainer disguised as a dog to steal the white fox-fur coat and presented it to the king of Qin's favorite concubine, and another retainer imitated a rooster's crow to trick the guards into opening the Hangu Pass gate.” true?

According to the 'Records of the Grand Historian: Biography of Mengchang Jun', his retainers 'at night acted as dogs to enter the Qin palace treasury and steal the white fox-fur coat' and 'a retainer who sat in the lower seats was able to imitate a rooster's crow, and when the roosters all crowed, they were allowed to pass through the pass.' The novel 'Chronicles of the Eastern Zhou Kingdoms' adapted this story, and although it is strange, it is recorded in history.