It's a nasty practice that's become common enough to warrant a new term: porch pirates.
As package deliveries surge during the peak holiday season, so too do the incidents of packages being swiped from doorsteps.
Specific data on package theft is limited, since shipping companies and retailers don't typically parse it out. The U.S. Postal Service insists the "vast majority of the mail it delivers arrives intact"; FedEx doesn't share stats; and UPS will only say that of the tens of millions of packages it handles daily, reported thefts are "scant."