When I try to research this question, all the scenarios people suggest are significantly different to my own. This is not one of those cases where a company tries to run a scam by sending someone goods in the hopes of billing them at a later date. It's also not a situation where I have received a package that was not addressed to me.
Here is what happened.
We received a package here in New York. The package had two shipping labels on it. Both labels have the same return address, a warehouse in North Carolina. One of the shipping labels was addressed to our home, and the carrier was UPS. The other shipping label was addressed to a retail store in Canada. The carrier for that label is unknown. Inside the box is semi-luxury merchandise that I would estimate has a retail value about $2000-3000 US.
What happened is pretty obvious. The package was intended to be shipped from the warehouse to the retail store. Someone at the warehouse slapped a UPS label addressed to us on the box by accident. A UPS courier picked up the package, ignoring the other shipping label, and it ended up at our home.
For the record, I am making efforts to contact the warehouse, the store, and UPS to return the package. I believe that is what will end up happening.
The question is, what if I didn't? If I decided to just keep or sell this merchandise, would that be a crime of some sort? You could say that their mistake is our good fortune, but the presence of the second shipping label makes the situation quite ambiguous.