The incident took place between 9am on Friday, October 13, and 6pm on Saturday, October 14, when a fuel card was stolen from a parked van on Heathfield Way, Northampton. The card has since been used to purchase a large quantity of fuel.
The man, or anyone who recognises him, should contact Northamptonshire Police on 101 or Crimestoppers anonymously on 0800 555 111.