Police are appealing for witnesses after a safe containing cash and bank books was stolen from an elderly man's home in Grainthorpe.
The burglary was discovered at the Wragholme Road property at around 9pm on Monday, March 10.
Officers believe the break-in could have happened in the previous 24 hours, after thieves entered the house by breaking glass at a back door.
They searched the property before stealing the safe, which contained cash, bank books and cards.
Anyone with information can call Lincolnshire Police on the 101 non-emergency number.