Thieves forced their way into a Yellingbo farm warehouse and stole up to $8000 in tools.
Yarra Ranges CIU Detectives are investigating the incident, which occurred at the Healesville-Kooweerup Road site at 1.35am on Sunday 23 June.
The thieves left with a Holden Statesman and tools valued between $5000 and $8000.
Police are reviewing CCTV footage.
Anyone with information should call Crime Stoppers on 1800 333 000.