The bag containing the memory card was discovered it in a walkway alongside the River Wandle in the Haslemere Industrial Estate just before Christmas.
Detective Constable Riaz Karolia of Wimbledon Police said:
"So far we have had no success in locating the owner of this bag. I am hoping that by issuing these images, someone may recognise the people involved and we can start the process of reuniting the owner with their belongings.
"The memory card contains images of someone's special day - if you know who these people are, please get in touch."
More top news
The Number 91 was travelling from Trafalgar Square to Tottenham in north London when it came to an unexpected halt.
It didn't take long for the converted flower shop to be snapped up. 220,000 people looked at the advert on Zoopla.
Glen Hazel, who was an 11-year-old schoolboy, has a clear memory of the events of 1966.