Sounds to me like this neighbor has too much time on his hands... A retiree called the police when he saw two men entering a home in his neighborhood in the middle of the day. He knew the house was for sale, but for some reason he assumed they were robbers instead of what they really were: a realtor and a potential buyer!
The nosy neighbor called the police who stormed the area. With guns drawn, they told the realtor and his client to exit the home with their hands up. They were handcuffed and detained by police, despite having a key to the home (which is what they used to enter the home, despite the nosy neighbor telling 911 they had "forced" their way in.)
Safe to say after this incident, no one will be buying that house any time soon!