While relocating some boxes, the entire inventory of a box was deleted upon mining. The shulker box still dropped, just empty. This happened to a box with some potion materials a few days ago, and those items randomly appeared into an entirely new shulker box I was upgrading today. I wasn't too concerned about the potion materials... but today the entire contents of my raw ore shulker box disappeared upon mining. Hoping the ore appears soon lol :P