Just a guess:
The company buys something.
You take it home and use it, no paperwork.
It's reported missing by the company.
It's a loss, shrink, theft, whatever you want to call it.
If the company is audited and the status of the item is clear, there would have to be an audit of peoples' homes at the same time to prove theft.

But it sure could happen, especially if it's not just a one-off kind of thing.