Chainsaws, a leaf blower, climbing equipment, a generator and disc cutters have been stolen from a farm near Thame.
Thieves stole the equipment from three containers at the Tetsworth farm.
The site was not secure and crooks used a crowbar and cutter to break off the padlocks of each container.
The burglary was at about 11pm on September 7.
There has also been an attempted burglary at a property in Lower Icknield Way, Chinnor.
Thieves tried to break into the property via the garage door between 8pm on September 5 and 3.30pm the next day.
Nothing was stolen from the site.
Anyone with any information about either incident should call police on 101 or Crimestoppers anonymously on 0800 555 111.