Has anyone else noticed these outside of guild leves?
I have yet to see one when not in "bound by duty" status for a guild leve. I've been running into them on my way to the mobs and recently realized, no one can usually see them but me. Sometime they're hard to find because you can't target them, you have to examine them via the menu.
Early on, it was only a handful of gil. But when doing Rank 10 leves I usually get a few thousand gil, and even got a Rank 10 hatchet while doing a Rank 10 Botany leve.