I have been making indestructible money boxes for my kids for years. They have the unique feature of being impossible to open without some serious tools, making them ideal for those who are easily tempted to spend their savings.
They also make excellent bookends or door-stops.
If you would like me to make one for you please visit my Etsy shop and request a custom order. http://deburghsteel.etsy.com
This money box has been opened twice.