OK, I'm posting here instead of alt.games.warcraft because I want to keep my little 'trade secret' of selling Weather-beaten Journals a bit more secret for as long as possible.
And it is semi-related to fishing as I found this problem while fishing. :)
Anyway, I found a Mithril Bound Trunk off the shores of Darkshore. I looted it but it didn't disappear meaning it has an item I can't use. It's not a fishing journal (obviously, as I was fishing when I found it).
So how can I tell what this 'secret' item is? How many items are there that behave like this? (I only know of the Weather-beaten Journal).
Interestingly enough, Thottbot says there have been no catches of Mithril Bound Trunks in Darkshore; yet I am 99.9% sure I caught it there.