Police officers have said it may take them "several days" to carry out an investigation near Huntly in Aberdeenshire.
They have been searching farm buildings since Saturday morning.
Police said it was part of a proactive inquiry in connection with drugs and stolen property.
Commenting on the time the operation was likely to take, Police Scotland thanked the public for their patience.
A number of cars and motorbikes have been loaded onto recovery vehicles during the search.