A number of lorries were targeted by thieves as they were parked at the Watford Gap service station overnight.
More than ten vehicles were targeted between 10pm on Sunday, November 1 and 6am the following day.
The side curtains of the vehicles were cut through, but nothing of value was taken apart from a rear light cluster.
Officers investigating the case have urged lorry drivers to be vigilant when they park their vehicles overnight.
Witnesses, or anyone who knows anything about these incidents can call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.