What We Have Here is a Failure to Communicate

This best selling author (someone who should have a firm grasp on the English language) called at least 25 freaking hundred times yesterday regarding his book deal contract with 25 million gazillion questions. The best of which was:

Best Selling Author: What is “i-t-s”?
Answer: Uh, it’s “its”. You know, possessive form of the pronoun it. Used in a sentence: Let’s cut your head open by its diameter.

Okay, class, today’s puzzle. I received a postcard from UPS noting that they could not deliver a package due to “Company or Person Unknown”.

Quesion: What’s wrong with this situation?
Answer: I RECEIVED the postcard.