I don't know about y'all, but I can't say I've ever received a package that wasn't meant for me. Mail, sure, but not a whole package.
I've always pictured it being like when you find someone's lost dog. You know you have to give it back, but it's still hard to let go when the owner shows up.
Instead, I should start imagining those packages as the things on this list. That'll make me give 'em up real quick.