I keep finding Lead: Lacquered Wooden Tone-Box but whenever I try to pick it up from the container that I found it in, it disappears. The game does that one kind of error sounding sound and then tells me the item is no longer available and I don't have it in my antiquities list under "J".
This has happened 4 times now with the same lead.
The 4th time it happened I screenshotted me finding it and then the message appearing in the top right corner as I click it (have to click it, can't click "Steal all" because it just won't work when the lead is there for some reason). See screenshots below.