I photograph some of these when I was there! [img=https://img02.platesmania.com/251012/u/f1j7bdgfp414et1bk9n3of7k5rdbm.jpeg]
ΔΕΔΙΣΑ seems to be written on the rear box. It its the Διαδημοτική Επιχείρηση Διαχείρισης Στερεών Αποβλήτων Ανώνυμη Εταιρεία (ΟΤΑ) , the Inter-Municipality Solid Waste Management Company (I think it's between Municipalities in the Prefecture of Chania)
That 939 on the license plate can't be a coincidence =)