I was working in Ogasawara last year for a construction company. One site was the location of 2 old hotels, and a couple of old coastal gun emplacements.
The back hoe was putting an access road through the site, and a hole in the embankment was exposed. Shards of porcelain were falling out, so I went for a look.
The hole was full of serving bottles for sake, of only two types. It was lined with bleached coral.I spent most of the day pulling them out. About 200 whole pieces, and more than that were broken.
My work mates avoided the hole. No-one went near it.They were polite when I showed them a piece, but completely ignored the subject all day.
The next week-end, I was having a meal with my work mates. The story about the site came out. The two hotels were the recreation centres of the Navy and the Army during the war. Just before the American occupation forces arrived, the hotels buried the sake serving bottles so that the invaders would not have the pleasure of using the same drinking vessels as the Japanese forces had. All the alcohol was tipped out, and the glass bottles broken.
When I left the island, I still had 200 porcelain sake bottles. I couldn't elicit any interest in that particular discovery. I took them up the hill behind the house, and buried them in the loose soil at the end of a cave. Ready for the next person...