Intruders forced open a back door to get in and take goods from a home in Bourne Road, Spalding.
The burglary happened last Wednesday, two days after the house had last been seen secured by a neighbour.
Anyone with information should call police on 101, stating incident 122 of November 6.
Meanwhile, police are looking for anyone who saw a collision on Meadowgate, Bourne, which left a car badly damaged overnight on Sunday.
No one was injured and anyone with details of the other vehicle involved should call 101, stating incident 170 of November 10.