The burglary happened at a house in Oakdale at about 1.30pm on Friday.
A man wearing a blue shirt and cargo shorts was seen leaving the address.
A police spokesperson said: "We are requesting the public’s assistance to help establish the full circumstances surrounding the incident.
"In particular, we are appealing for information about the unknown man and possible sightings before or after the burglary.
"Anyone with information that could assist the investigation should contact North Yorkshire Police on 101, select option 2, and ask for James Skaith. You can also email [email protected] If you wish to remain anonymous, you can pass information to Crimestoppers on 0800 555 111."