Police have released CCTV footage of people who were in the area on the night that Samuel died.
They are still trying to identify around 32 people who can be seen in the footage - which was taken in and around the shops outside Penge East Station between 21:40 and 22:00 on Saturday 12 February 2011.
More top news
The impact of the 4mph crash pushed the buffers back by over a metre.
The 18-month-old puppy lives with owners Chris & Gillian French and their 10-year-old daughter Mia at the Mitre pub in Richmond-upon-Thames.
Detectives are hunting two suspects after the 23-year-old victim was left with a broken rib and a deep cut to his lung.