The New York Police had taken note of the seemingly uncaring action of Señor Lido's companion as reported by witnesses, and took a deeper look into the dead courier's background. Although he was identified as a Spaniard, they were puzzled by the fact that the dead man's papers were in German, not Spanish; his notebook contained names and possible assignments of some U.S. soldiers; his clothes contained no labels. Moreover, a check made at the hotel room yielded maps, articles on military aviation and other curious items. All of these items were turned over to the FBI.