Popular Mechanics had such a trick, about forty
years ago. The trick was to put a weighted flag on
the blind side of the box. When the driver opens
the box, the bottom weight pulls the flag
vertical. Of course you have to reset this after
you get your mail out. Not much use in freezing
weather.

One other variation was the button inside the box,
wired to a buzzer in the house. Or, low voltage
door bell that bing bongs when you mailbox door is
opened.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
..


"HeyBub" wrote in message
m...

Having gotten this far, check the mailboxes at
your local box store. There's
an easy way to add a small flag to the box such
that the flag goes up when
the door is opened and you can discover the trick
by looking at the display
models.