The Jackal had taken an impression of the key to the apartment, and presumably had therefore made a copy. That means he could have simply slipped past the concierge while she was in the kitchen and gone up the stairs to the apartment without her knowing.
That way, if anyone had come into the building to ask if she had seen anything, she would be there to answer "No", instead of being found lying on the floor.

Film

Il giorno dello sciacallo (1973)

Persone

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SerieTv

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