Where did the two of you meet?
How old are the two of you?
In what ways do you feel he is hiding things?
Did you ask him why he took a po box?
Where did he live before he moved into your house?
Thank you for that info
Who's idea was it to get married so soon?
Does he work? Who makes more money, you or him?
Has he been married before? Was he from your town? Did you meet his parents?
Anything else that seems strange to you?
There's no way to really know why he did it without seeing his mail. He could have bills or things that he doesn't want you to see. Phone bills, letters, other bills, magazines, books, who knows? Where does his mail go after he gets it, is he leaving it in the car, at his parents house or bringing it home? I would say since he stopped texting when you asked, he may change his mail too? It is a little strange because he could have continued to have it come to his parents house right? The best thing you can do is ask him why he's doing it, and ask him to stop. If you are married, both of your mail should come to the house. There shouldn't be a reason to hide anything from one another.
I welcome your thoughts, let me know if you want to talk more
I know you've probably already thought about this, but it's possible you should have waited much longer before marrying someone you don't really know. Of course it could be mail from an ex or a girl. You say bills, no problem, but from this point on, his bills are your bills too! Its not wrong to feel the way you are feeling at all. There's no reason why a husband should have his mail going to a PO box unless he's trying to hide something.
As for his not being able to be contacted for two hours, I don't know what that's about.....but if you let him get away with it, he's going to think it's ok and continue doing it. Why should you be expected to trust someone you barely know? Why should you be expected to trust someone who pays for a po box, so their mail doesn't come to their home and who disappears without responding to your texts or phone calls?