I am in awe of how the new stealables are never visible ... I've only even spotted 2 stealables since launch ... the underworld and abyss must be absolutely crawling in hidden thieves.
I run thru every few days. I've gotten the book of truth, the dirty frypan thingy, and the half eaten meatloaf, in addition to a few webs and the goblin jugs. What I really want are those dead plants and that pot, mmm. Just go at a weird time and keep checking.
Don't forget to go back to the old dungeons too - I got the books from bedlam last week, first time ever!