The Douglas County Sheriff's Office is warning Highlands Ranch residents of a fake cable guy who may be casing homes to burglarize.A man claiming to be with Comcast stood on the doorsteps of a house in Pepperwood Lane last Wednesday night and told the resident that he was coming to pick up a cable box, authorities said.The resident told the man that he had problems with his cable before but it had been restored. The resident was suspicious not only because it was 9 p.m., but also because the man had no identification that said he was with Comcast, was not wearing a uniform and was driving a car that didn't have any Comcast logos on it.The suspicious man was carrying brochures with the name Comcast on it but they appeared to be photo copies, the resident said. The resident told authorities that the impersonator got nervous when the dogs started barking and he jumped in his car and fled.The resident called Comcast, and a customer service representative said that there were no service calls scheduled for his house or in the area and informed him that it's unlikely that a Comcast employee would be at his house so late.The man called the sheriff's department and deputies drove around in the area but were not able to find the suspicious man. He was described as a white and about 5 feet 10 inches tall, with medium build and brown hair.He was driving a green, four-door compact car, similar to a Honda Accord, deputies said.If you believe you have been contacted by this person in a similar situation, you are asked to call the sheriff's office at 303-660-7500.While this resident used good judgment in questioning the suspicious incident and no crimes were committed against him or his family, the sheriff's office said the community needs to be on the look out for these types of con artists, who could be looking to case the neighborhood for easy targets to burglarize or could be knocking on doors to determine who is home and who isn't, authorities said."Use good common sense when it comes to possible solicitors and service personnel that may knock on your door. If you are expecting someone at your home for repairs or service, check the work order before allowing them to come in. Ask to see proper identification. If it seems suspicious, call the company and verify who the person is. If you are not expecting any service even though the person says they have a work order, call your local law enforcement right away," said Sheriff David Weaver.