Is there even a problem? I mean, I was able to sell piles of dust to Harnquist, rotten meat to the cook and in fact anything I stumbled accross as of yet (yes, I tend to clean the map). For zero tria, of course, but with the sack method, you even lose tria, so... except that sacks can maybe be sold at more merchants than piles of dust, but given the origin of these piles, that shouldn't really be an issue?