Thieves have targeted Hirepool in Auckland and Wellington, stealing hundreds of thousands of dollars worth of hire trucks, trailers and outdoor equipment in two months.
In a memo to all Hirepool staff the firm's chief operating officer, Colin Sinton, listed 54 items as stolen in December and January, but said 13 had been recovered recently.
The list includes various sizes of trucks, trailers and equipment such as chainsaws, compactors, weed eaters, leaf blowers and waterblasters.
Mr Sinton said the gear was likely to have had its Hirepool branding removed. "All of these items have been reported to the police as stolen."
He urged staff not to approach anyone or to try to retrieve the property themselves, but to report it to police or consulting company Resolvit, which was helping with the inquiry and asset recovery.