Thank you...it has a stamp on it as inspected when being sent back in 1945, and most items from the trunk it was in are tagged as well (several army and navy tunics, pants, a canteen, etc). Any way to post in Japan to see if the group is still around? I'd be open to returning it to someone it would be important to.
This is a directory of Okinawan people who lived in Kansai region published in 1935, so the group might be in Osaka, not Okinawa. Here the 8 members. 島尻 Simajiri in the parentheses after the names shows they were from Shimajiri region in Okinawa main island. region 天神橋筋 安里仁祥（島尻）
region 長柄西通 新城仁徳 山城蒲戸 新城次郎
region 本庄西通 並里武雄 安里次郎
region 本庄中通 山城信吉（島尻） 長濱栄助（島尻）
And the followings are the rest members. 安里善幸 新城亀吉 安里盛信 山里栄雄 安里清行 安里松 山城亀 長濱栄秀 新城栄久 玉寄武治 上原重雄 玉寄盛光 新城正吉 安里仁 新城松吉 譜久元昌得 玉寄俊雄