It happened sometime between 14:00 on Saturday 26 September and 16:30 on Monday 28 September.
Anyone who saw or heard anything in relation to this incident is asked to contact PC 158 Markwick on 01481 725111.
Alternatively, witnesses can contact Crimestoppers anonymously on 0800 555 111, quoting reference number OC2000006716.
Pictured top: Guernsey Police is trying to track down the person who caused the damage.