Exactly, you are just guessing. But the accusation is that he stole a key, nothing else. No report of bad behaviour. I'm guessing he stays because she refuses to refund him.
I don't get triggered, automatically shouting 'hang him high' through a mere headline.
The rest of your post is simply a figment of your imagination. If you pay, you have a contract. The management cannot apply rules abitrarily. They can ask you to leave, but they have to compensate you for doing so.
Imagine that if you have a contract to stay somewhere and when you arrive the management notice that you are covered in tattoos and become afraid. Do you become a trespasser if they ask you to leave? Use your intelligence man. If he has paid, he is not a trespasser. The management/owner can request him to leave by fully refunding him and thereby nullifying their contract...if he agrees.
She learned the short form of his name because he was being undesirable? Do you ever read what you write before pressing the button to submit your reply? It's quite ridiculous.
Short form denotes that they became acquainted. She would have his full name via his passport. No one in my building uses a short form of my first name.