Paper and/or Stickers (optional)
Cover shoe box in paper. I taped and glued mine in hopes that it would last a little longer but I don't think it's going to make a difference. Cut a slot in the top of the box. I put letters on the top that says mail, they were promptly torn off. Make "letters" to go in the mail box. I had M* put some stickers on some 3x5 cards for our letters. I think it would be fun to put a new letter in every so often. Maybe some days put some "packages" in, like some dollar store toys or a treat.