Police are baffled over why thieves would steal doors from post boxes in three Lincolnshire Wolds villages recently.
Rural residents are being asked to be vigilant and report suspicious activity after three Royal Mail post box doors were targeted.
The door of a post box in Mill Lane, New York was reported stolen on July 14.
Another was stolen in Benniworth on August 2, and a third from the Thornton end of Fifty Acre Lane, near Horncastle, on August 3.
Anyone with information is asked to contact PC Gary Young at Horncastle Police Station, by calling 101 and quoting inc 197 of August 3.