From Life Hacker:
Money weblog SavingAdvice spoke with a former burglar about how best to avoid getting swindled.
Said burglar noted that "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.
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More places to store your cash:
Seven places to hide cash in your house
How to store cash for your "tri-level emergency fund"