Overnight on August 14/15 offenders forced entry to a farm office in Moor Road, Caistor.
A Stihl chainsaw and petrol can were stolen from the site, but nothing was taken from the office.
Police are warning people to be vigilant, as this may have been a precursor for a further visit.
Call 101 with information.
Call police if you see any suspicious vehicles trawling the area please inform police.