Who was phone seeking man?

  "After the assassination, a policeman or some man came rushing into the School Book Depository Building and said, `Where is your telephone?' He showed me some kind of credential and identified himself, so he might not have been a police officer. . . . `Right there,' I answered, pointing to the phone. . . .

-Lee Harvey Oswald



Who the CF was this guy asking for the phone?? It wasn't the officer who later confronted Oswald in the dining area...