The Best Place To Hide Money: Conversation With A Burglar - SavingAdvice.com Blog
http://www.savingadvice.com/blog/2007/02/05/101141_the-best-place-to-hide-money-conversation-with-a-burglar.html

"If I can't find money and valuables in the normal places I usually find them, I would continue to tear the house apart until I found something," which is why the post advises that, in addition to your hiding spots, it's best to leave some money out in obvious places if, say, you're heading on a vacation and are concerned about would-be thieves. This can not only save your other stash of money, but may actually keep the burglar from destroying your place as he looks for where you have hidden your money. If they believe they may have found the cash that you have in the house, they are much less likely to keep looking (remember, they want to get out asap). In the end, if you hide all your money well, you may win a moral victory in not letting the burglar find the money, but you'll likely have much more damage done to your place that will end up costing you more in the long run.

Should you spend your money on a home security system? A look inside a burglar's mind might help you decide.