I had those pics but was afraid to post them for fear of some issue. Glad they're here now. I had a Jap Katana, arsenal sword for a time when I was young. Black lacquer scabbard like that except one hanger ring, black wrapped handle and was plain but beautiful...long gone now. This one of course would be worth thousands...
I've not been there, have known about this for decades. We had our own attack at Estevan lighthouse... Estevan Point Lighthouse, British Columbia Canada at Lighthousefriends.com
Even while I was a young soldier there was a search and demolition of ordnance found at the low water line...several projectiles found in the '70s.