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I suggest you split them up and present them one by one.
Those letters seem to be nothing special. For example, the last one (the one with a carpenter's square) says; the greetings of the season, I(= the soldier) think you(= his family) are well, I'm also well, it's been raining here every day, it's hot in the daytime but very cold in the morning and evening, please give my regards to the neighbors, etc..
Interestingly, a soldier 池森長三郎 Ikemori Chōzabō often mentioned baseball in his letters. I found that he survived the war, and after the war, he served as the village mayor of Miwa village (the present Ashikaga city, Tochigi prefecture) from January 1946 to March 1955.