I've saved some relevant frames from the movies. They are too big to post.
Ohh, here comes the postie, accross the road. Another 6 houses and she'll be at our place. I wonder if we'll get mail today. I like getting mail.
Ka-ching! We've got mail!!
Oop. The neighbours kids having a play.
La-de-da.
I wondered why there was marks over our lawn a couple days back. They just circled the box for several mins looking inconspiquous( Not!),

until......

Oi! Ya thieving shit. What are ya doing?!?

You can view the actual deed here.
A 20sec mpeg, 1.17mb, surrounding this frame.

(PS the whole thing is 60mb, hence I only posted the relevant bit.)

Legging it w/ the booty.

There was no mail in the box when I got home.

So, whats the end result, you ask. Well, after a bit of thought I have decided to let things lie.
A padlock is now on the box and I shall keep an eye on it. Basically, I think its kids being kids and I'll try to keep the peace in the street. Obviously there is a limit to this, so, unless this happens again, there is still, at least, harmony between the neighbours :-) The mail was prolly a bill anyhoo.
I caught the footage with GOTCHA! One of the better home webcam security programs out there. They have a demo for download, I think.