Detectives are hunting a thief who stole a police diary while officers conducted a raid in Douglas St, Herne Hill, on 23 September.
Investigators said an unknown person stole the diary from an unlocked police vehicle parked nearby while detectives were executing several warrants about 6.15pm.
The diary was new and contained no sensitive information, according to police.
Geelong Crime Investigation Unit detectives made a fresh appeal for information today.
They urged anyone with information on the diary or its whereabouts to phone Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au