Police are hunting for a Lego looter in regional New South Wales, and the perpetrator is sure to be bricking it.

About $8,500 worth of the popular plastic building blocks were stolen from a toy store in Young, in the state's south-west slopes.

Police have begun piecing things together, and today released CCTV footage of a man they believe can assist with inquiries.

They said an unknown offender forced entry to the shop on Boorowa Street about 3.30am on April 17.

They believe the Lego-loving assailant fled the scene in a vehicle.

Young Toy World's Brad and Cathy Penson had valuable Lego stolen from their store. ( Fairfax Media: Craig Thompson )

Detective Inspector Scott Wilkinson said the items were desirable and expensive.

The stolen boxed sets are believed to be worth between $150 and $550 each.

"It's highly likely that they could be on-sold online, I'd be asking people to be highly suspicious of products that are being sold for cheaper-than-expected prices, and in particular if there's a large number of items being listed from the Young area we'd be very interested in finding out about that," he said.

"To tell the truth, this is the first time I've had any experience with Lego being stolen, but I know it is highly desirable and it is expensive, so there is probably a readymade market for items that are not quite as expensive as those bought legitimately."

'We're talking about people's livelihoods'

A Lego policeman chases a Lego robber. ( Flickr: stavos52093 (CC:BY-NC-ND) )

Detective Inspector Wilkinson said the theft was serious.

"While we are talking about toys, and we're talking about Lego, the total value of this property is around $8,500," he said.

"We're talking about people's livelihoods here, the success of this business, whether it continues or fails, could well depend on that sum of money."

The store's owner said he was glad the police were looking into it.