I've been keeping an eye out for these green boxes, in a sad anorak sort of way. There seems to be three types - the tall ones, with lots of doors, that seem sturdy but mysteriously are never vandalised (well not around here); the old, what looks like, iron/steel type with a big chunky lock on the door - these don't seem to be vandalised; and the modern small ones that are forever been broken into. Most of them around here have been given a good kicking so the door(s) is/are all bent in.
So blame progress methinks