South Coast Police are investigating possible mail theft from rural properties within the district.
Police said incidents have been reported in Berry and West Cambewarra and believe other properties could have been hit with owners unaware.
Police are asking residents to keep a look out for a white van occupied by a male and female.
"Residents would be aware of their mail contractor and we ask if any suspicious van or vehicle is sighted in or around letter boxes in their road to please obtain a registration number and contact police.
"Police ask residents to ensure where they can to have their letter box locked," a statement said.
Reports can be made by calling Crime Stoppers on 1800 333 000.
Image: NSW Police