Possible scammer posing as AT&T employee

I recently had a man come to my home asking to gain entry to my backyard. He said that he had information that there was an AT&T box in my backyard and wanted to look at it. I told him there is no AT&T box in my backyard, and my gate is locked with my two dogs outside. He claimed to be with AT&T but did not have a uniform on or a name tag, and there was no AT&T vehicle anywhere nearby. I refused to let him in my backyard. I called AT&T and asked if this is standard procedure since I have not had land line service with them for more than 20 years. I was told they did not send anyone to my home, and their employees would have on a uniform and name tag.

Has anyone else had this happen?