He was also alleged to have spat at one of the female station staff members.
The wallet contained about RM6,000 (S$1,900) and S$1,000 in cash, along with important personal documents.
The petrol station warned that if no response was received within 48 hours, a police report would be lodged.
The shop's co-founder called it the "greatest magic show in Singapore's history".
The car, which was entering the KPE, hit the motorcycle from behind when it slowed down due to congestion.
The man reportedly filed a police report only over the missing IC.
The police classified both cases as unnatural deaths.
The lorry driver did not notice the cargo falling off.
Netizens teased the police officer for buying the fish to save face.
The situation was only resolved after three reports and a Reddit post.