I don't know if this has been mentioned in other threads-- I'd be surprised if it hasn't-- but earlier this year (beginning with Elsweyr?) I started noticing that sometimes a treasure wouldn't have the little gold bag icon that flags it as being a treasure. This means that when you go to the NPC merchants, click on the Sell tab, and click on the Miscellaneous tab, those treasures don't get listed at the top of the window the way other treasures do. After you sell the treasures which are flagged as such, you must scroll through the window to see whether there are any other treasures you can sell. Does anyone know why this is, and why it hasn't been fixed yet?
I've fought mudcrabs more fearsome than me!