I think the idea is you have the card, therefore they get a signature and that covers them. After all if you were stealing the package you would have first had to break in to the house to get the card. Or am I missing the point you're trying to make?
Totally-braindead, no I don't think you are missing the point. If I live in a house occupied by many students I can pick up anybodies mail that comes through the letterbox. If it is this Non delivery card with a signature box I can sign any name I like (how do they know) and get the parcel/package.
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