By Andrew Mortland
Imagine a big key ring, full of keys. Maybe it is the kind a janitor or building manager carries — one with dozens or hundreds of keys on it.
If you found a set of keys like this, your first instinct might be to get them back to their rightful owner. But imagine if a criminal found or stole them. The key ring for a single building might unlock hundreds or even thousands of doors. Behind some of them are valuables he can steal or resell.
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