Even with a PO box, you can get confirmation of delivery and signature service. But those things are no good if the addressee fails or refuses to...
Notice that the edges are rounded. Proofs have sharp, square edges. Your pics leave much to be desired, too.
Not a die crack, but may be a lamination.
It won't even get you a butt.
If I remember correctly, to be a wide AM, the AM must be the same distance apart as the ME. This is not.
You could post a pic, but I'm thinking the coin was struck with a filled die and has no value over face.
Bottom right coin is definitely questionable.
Separate names with a comma.