Did you know that I got my neighbors mail once?
Could you tell me how you got their mail?
I was really surprised from their lack of privacy, I wish other people could have similar values
It is not right to take something that is not yours. Your neighbor may really be looking for that mail.
I'm still deciding whether to return it or not
You need to return it, because keeping it would be a felony. Would you like to go to jail just because you decided to keep some mail that you didn't even need?