Thieves have stolen a Royal Mail van filled with letters, parcels and packages.
The vehicle was taken while its driver was emptying a postbox on Wolterton Road in Poole, Dorset, at around 5.30pm on Friday.
Dorset Police said the van contained a "large quantity" of letters, parcels and packages, some bagged in grey, blue or green Royal Mail sacks.
The postman did not see who stole the vehicle, which was later located in a nearby business park by the National Police Air Service helicopter.
Police Constable Tim Gooding, of Dorset Police, said parcels and packages had been removed from the van before it was discovered, with only a few letters remaining.
"I am keen to speak to anyone who saw a Royal Mail van in strange circumstances, during the evening rush hour on Friday May 9 2014," Pc Gooding said.
"In particular, I would like to speak to anyone who saw the vehicle being unloaded around Yarmouth Road or Bourne Valley Road in Poole.
"I would also like to know if anyone has seen discarded postbags, parcels and packages."
Anyone with information is asked to contact Dorset Police on 101.