Stuart Lanham from Lanham's Motor Group said they lost two plates recently, but had CCTV footage of the crime.

"I turned up to work and the cars had no licence plates," he said.

"We've got CCTV of it all, it's currently with police."

He estimated the cost of replacing the plates to be about $300.

Mr Lanham was primarily worried about what opportunists might do with the plates now that they have them.

"You can commit a crime and when the rego number is reported, it shows that it's not from that car," he said.

"Just adds a little bit of time. It's a means to an end for them to not look as suspicious."

Inspector Kim Traynor from the Murrumbidgee Police District confirmed police were looking into the matter.

"Police are monitoring the situation in relation to the number and frequency that it's occurring," she said.

"It's not unique to Griffith.

"We've been getting a number stolen not just in Griffith, but in the whole Murrumbidgee area ... there's a number of reasons why this might be occurring.

"Police are monitoring the situation in relation to the number and frequency that it's occurring. It's not unique to Griffith."

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She added police have recovered a number of plates, both already attached to vehicles and by themselves.

Inspector Traynor said anyone worried should look into specialised anti-theft screws.

"You can get specialised anti-theft nuts to screw your number plates on with so you need a specific tool to unscrew them," she said.

"You can get them through hardware stores ... in some areas, they've encouraged that."

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