The surveillance video released on Monday was taken at the port city's central Dammtor S-Bahn commuter train station, close to where the newborn infant was discovered shut in a suitcase.
Just a few days old, the healthy baby girl was found outside the city's CCH convention centre around 7:30 pm on January 4.
The video taken around 3 pm that day shows a young man with short dark hair and black clothing, carrying a suitcase that bore the same branding as the luggage in which the infant was found – Omica.
Last week daily Bild reported that “a well-dressed man” told CCH doorman Naji Habib: “There's a suitcase outside, please take care of it.” After Habib had a member of the security staff bring it inside, he heard noises but didn't think it was coming from the piece of luggage.
“Half an hour later I heard crying again and I opened the suitcase with a colleague,” he told the paper. “There was a pretty little girl, dressed in a romper suit, cap and in a baby sleeping bag.”
The baby, who has been named Marie, was taken to a clinic and pronounced in good health.
The police said the infant had not been delivered in a professional setting owing to how the umbilical cord had been cut.
Marie continues to thrive and will be placed with a foster family sometime next week, police said, adding that a number of potential parents around the world have expressed an interest in adopting the little girl.