A male business owner was locking up at the back of his premises when two male offenders jumped over a fence and snatched a bag from him, containing a significant amount of cash.
Police say this happened on January 14 at around 10.20pm in Burton Road, Lincoln.
The suspects fled by jumping back over the fence and running towards the Mill Court area. The only descriptions of them are that they were wearing dark clothing and balaclavas.
The incident prompted a police appeal urging anyone with any information to call Lincolnshire Police on 0300 111 0300 or report anonymously to Crimestoppers at 0800 555 111.