This situation actually happened to me last month.
I opened my front door to discover a package somewhat larger than a shoebox on our front porch. I picked it up to see who was sending us a Christmas gift or what my wife might have ordered. But lo and behold it was a package addressed to our neighbor. I don't know how long the package was there, as I don't only use my front door to exit our house; probably not more than a few days though. I don't know what was in the package. I didn't notice if it was delivered by mail or a delivery service. I called our neighbor, made sure she was home and walked the package over to her place. She thanked me and basically that's where this real life story ends.
In alternate realities I might have kept the package and argued that possession is nine tenths of the law. My neighbor might have realized her package didn't arrive and asked around if anybody had seen anything. I might have denied that I had it. I might have said that I was keeping it as a memento. My neighbor might have accused of me of stealing her stuff. The police might have become involved; I might have become recalcitrant and they might have searched my house for other "packages". The local media might have demanded to know why I don't immediately inform the public (this is my first admission) that I had been inadvertently holding something clearly marked with my neighbor's name and address. Some citizens might have demanded to know why I haven't been prosecuted for the "crime" of the possession (albeit temporary) of a package not intended for me.
One final confession. The package on our porch wasn't the first time something like that has happened. We've previously received mail and packages intended for other people. We don't keep any of them.
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