Police are investigating the theft of several post boxes in South Holland, West Norfolk and Cambridgeshire.
The iconic red post boxes have been taken from sites including four from the Spalding area.
“We are investigating a report of the theft of four boxes in the Spalding area,” said a police spokesman.
The boxes were taken from Dawsmere, Gedney Dyke, Lutton Marsh and Whitehouse Farm at Gedney on February 9.
A spokesman from the Royal Mail said: “We have more than 115,000 postboxes across the UK and the theft of postboxes is relatively rare.
“However, Royal Mail takes the issue very seriously, and works closely with law enforcement agencies to prevent the unlawful removal of post boxes. We also deploy preventative measures and technologies to deter theft. These measures include forensic tags, permanent metal marking systems and electronic tracking.
“In the event that a crime is committed, these features can help our investigators to identify and trace stolen property as well as potential offenders. If customers have any concerns about their mail, they should contact our customer service team on 03457 740740,” said a spokesman.
Lincolnshire Police are appealing for anyone who may have any information, including on a dashcam, to contact them on 101 quoting incident 251 of February 9.
There have also been reports of stolen boxes in Tydd St Giles, Walpole St Peter and Wisbech over recent days.
Last year a number of boxes were stolen from areas of rural Suffolk and West Norfolk.
They were mostly the smaller boxes attached to a wall or a post rather than the large pillar boxes.
Police in Norfolk believe a couple of the boxes, which bore the cipher of GR – George V – were sold online to private collectors.
Suffolk Police also thought there was a pattern with ‘heritage style’ boxes being taken and possibly sold on.
They were cut from their metal or wooden posts overnight with an angle grinder or chainsaw.