You know I am getting more and more confused about the mailbox the more I watch. The whole last part of the film Ennis seems to be in real depression and despair. From the last scene at the lake, to Cassie at the bus station, then of course the phone call and lightening flats.
In fact I have been rewatching Lightning Flats and if possible it seems that Ennis is even more distraught and in a greater state of grief as he left then I even originally thought. In fact I think that is why Mrs. Twist does put her hand to her throat, not because of Mr. Twist but because in looking into Ennis's eyes after he finds the shirts she now understands everything between Jack and Ennis, and she feels Ennis's true grief and she is feeling the pain of his pain.
Anyway that is why I am now even more confused about the mailbox. Ennis seems to be out of that deep depression, with the care and the focus of getting the numbers just right, and he is now able to hug Alma Jr. (which he never did before) and even joke with her a little. Of course his true feelings still show when she talks about Kurt. But I cannot figure it out.
Has he recovered and decided to really move on with life?
(Another question, why does he now have a fancy knife set, when before he could barely even eat? I have been wondering about this.)
Or is he now living in some sort of fantasy life with the shirts and the mailbox waiting for Jack like the book Ennis dreams constantly of Jack, and so has he found some peace with his fantasies and dreams?
I would like to think that he has somehow decided to live, but I tend to not think that is the case.