BadgerVadger

Disclaimer: not LE or a professional in this field BUT just graduated with an anthropology degree focusing on forensic anthropology and bioarchaeology and you would be fucking amazed at how good we are (and thus the professionals even more) at guess-a-bone from a minute tiny fragment of a whole bone, as well as determining anything like species, age, origin, gender, etc. based on just a fragment. If they had reasonable suspicion that something might be coming through based on the area I wouldn't be surprised if they could start making some associations with particular crimes. That being said you're dealing with sewer refuse from an indeterminably large area, I don't think it's a stretch to say the vast majority is just animal bits. To call in every chunk of bone-like material would be a massive waste of resources. My last forensic professor also actively works for local LE and she said more often than not when someone calls in a report of remains they turn out to be animal, or just straight up rocks that look vaguely skeleton-like.

If you want yea go for it man, probably help me kill a couple hours later. I do environmental work in CA parks now so I won't be sending it to any Cold Case divisions.