First I would really like to thank you for creating such an elaborate mod and all the time put into it.
In the interest of saving you time, I too had the problem with never finding any feral poo which bothered me.
Not beeing a coder I looked for the intricacies of foraging and finally found them in the /media/lua/server/farming/HCscavengeDefinition.lua
In there there is a mismatch between the local names and the ones you insert in the table.insert functions.
After matching those i was able to find feral poop in game again.
I hope this helps you squash this bug and move on to being awesome