Two lorries had their trailers slashed open by would-be thieves who checked whether there were valuables stored inside.
The HGVs were parked in a compound at P Bromley and Sons, in Wimsey Way, Somercotes, when the trailer curtains were slashed open.
Nothing was stolen during the incident, which took place between 5pm on Wednesday, 5th March and 8am the following morning.
Police want to trace any witnesses who may have seen people acting suspiciously in the area between those times.
Anyone with information should call police on 101 or Crimestoppers, anonymously, on 0800 555 111.