Officers are trying to trace two men who went into a shop and conned staff into giving them cash.
Police are appealing for information after a fraud took place at the One Stop Shop in Churchill Way, Burton Latimer, on Tuesday, December 16.
Two men entered the shop at about 7.30pm and asked to change a large sum of money for smaller notes.
During the conversation the offenders repeatedly changed their minds about what they wanted, confusing the shop staff.
One of the men further confused things by asking about various forms.
Officers believe the offenders deliberately set out to confuse the shop workers before making off with more cash than they arrived with.
Both men were Asian and of medium build.
Police would like to speak to anyone who may have been in the One Stop Shop in Burton Latimer on December 16 and saw these men acting suspiciously.
Witnesses or anyone with information is asked to contact police on 101 or Crimestoppers anonymously on 0800 555111.