"Yes police, hear's a package of my neighbor Gary stealing my package. I bet he's been the one stealing all the other packages on the block too, he's on disability or retired or something and is always home"
"Yes police, hear's the UPS carrier delivering one package and stealing one the USPS driver left".
"Yes police, here's video you can keep. In the event you catch this individual stealing another package from someone you have evidence of another instance".
>and a victimless crime.
If the shipper replaces it then the company is the victim and their shareholders. If the shipper doesn't replace it (perhaps it was a birthday gift from Aunt Milly in Topeka and she's on a fixed income and can't afford to make you another sweater right now) then the recipient is the victim.
Never mind the fact that it is a felony under federal law.