If not, the policeman who wrote it up should be questioned and the person who made that claim should be charged with providing false information.
I'm not aware of any "impersonating a phone repairman" statutes, as long as they didn't touch the phone system.
And what happened to the fourth guy who wasn’t in court?
According to the charging document, they asked about the phone ‘closet’, and were directed to the GSA office in the building that controls access to places like that. They were not given access, and did not go there.
Here the FBI agent’s Affidavit: