Our mailbox is located in an area separate from our townhome and requires a key. My spouse has requested a set of keys. We do not want him to have access to the mail. He has asked me to take him to hardware store to have keys made. He has walked to the mailbox (with his oxygen tank) waiting for the mailman. At one time the mailman gave him our mail. I had to call the postmaster regarding this.
Sometimes I mail a card to my hubs here, just for fun. He never opens it!
Only thing I can think of, rent a mailbox at the post office or UPS office for important mail. That way, your hubby can gather the mail from the townhome mailbox cluster, and the mail would be mainly junk mail and catalogs.