Looks like your V-mail cover picked up a couple of auxiliary postal markings trying to locater the addressee. The contents can be very personal, and the addressee may have saved the contents.
In the Aug 16 1944 letter I mentioned above, Don tells Harold "I can come home next week, but please don't let Mom know that I've decided to stay to the end" That was 7 months before he was killed.

Harold and Laurie never did tell Grandma about that letter.