Officers stopped pedestrians and drivers and showed them CCTV images of a man they want to speak to.
Det Sgt Stuart Gillies said: "Yesterday's revisit to the scene was definitely worthwhile and we spoke to members of the public in the surrounding area in an attempt to gather more information about this incident.
"Our inquiries are at an early stage and I would continue to appeal to anyone who knows who is responsible to come forward.
"Somebody knows who committed this crime and we understand that RBS are offering a significant financial reward for any information that leads to the arrest and conviction of the person responsible.